diff --git a/apps/mobile/src/lib/__fixtures__/shared-catalog.golden.json b/apps/mobile/src/lib/__fixtures__/shared-catalog.golden.json
index d1b3ba90..1d47242d 100644
--- a/apps/mobile/src/lib/__fixtures__/shared-catalog.golden.json
+++ b/apps/mobile/src/lib/__fixtures__/shared-catalog.golden.json
@@ -21,13 +21,7 @@
   "about.techStackLabel": "Stack",
   "about.techStackValue": "ASP.NET Core 10 · PostgreSQL 16 · React 19 · React Native (Expo) · Ollama (Gemma 4) · OpenAI gpt-4.1-nano · Docker · Cloudflare Tunnel",
   "about.title": "About",
-  "addMenu.ariaLabel": "Add content menu",
   "addMenu.browseAll": "Browse all books",
-  "addMenu.browserExtension": "Browser extension",
-  "addMenu.comingSoon": "Coming in a future update",
-  "addMenu.emailBook": "Email a book",
-  "addMenu.mobileApps": "Mobile apps",
-  "addMenu.pasteUrl": "Paste URL",
   "addMenu.title": "Add to library",
   "addMenu.uploadFile": "Upload file",
   "authors.bioAndBooks": "{name} - Biography and books",
@@ -45,7 +39,6 @@
   "bookDetail.backToBooks": "Back to Books",
   "bookDetail.backToHome": "Back to Home",
   "bookDetail.browseAll": "Browse all books",
-  "bookDetail.chaptersHeading": "Chapters",
   "bookDetail.continueReading": "Continue Reading",
   "bookDetail.downloadForOffline": "Download for offline",
   "bookDetail.downloading": "Downloading {progress}%...",
@@ -133,11 +126,8 @@
   "guest.signOutTitle": "Sign out and lose everything?",
   "highlights.emptySubtitle": "Select text while reading to highlight it",
   "highlights.emptyTitle": "No highlights yet",
-  "home.hero.cta": "Browse catalog",
-  "home.hero.subtitle": "Read classic literature. Build vocabulary. Track your progress.",
   "home.recentAuthors.title": "Recently Added Authors",
   "home.recentAuthors.viewAll": "View all authors",
-  "home.recentBooks.read": "Read",
   "home.recentBooks.title": "Recently Added Books",
   "home.recentBooks.viewAll": "View all books",
   "librarian.ask": "Ask",
@@ -174,12 +164,10 @@
   "library.actions.confirmDeleteTitle": "Delete this book?",
   "library.actions.delete": "Delete",
   "library.actions.deleting": "Deleting…",
-  "library.actions.downloadOriginal": "Download original",
   "library.actions.editMetadata": "Edit metadata",
   "library.actions.markFinished": "Mark as finished",
   "library.actions.markUnfinished": "Mark as unfinished",
   "library.actions.menu": "Options",
-  "library.actions.open": "Open",
   "library.actions.removeFromLibrary": "Remove from library",
   "library.actions.retry": "Re-process",
   "library.actions.retrying": "Retrying…",
@@ -201,14 +189,9 @@
   "library.discuss.label": "Talk this book over",
   "library.emptyLibrary": "Your library is empty.",
   "library.failed": "Failed",
-  "library.failedToProcess": "Failed to process",
-  "library.filter.all": "All",
   "library.filter.clear": "Clear filter",
   "library.filter.empty": "No books match this filter",
-  "library.filter.failed": "Failed",
   "library.filter.finished": "Finished",
-  "library.filter.notStarted": "Not started",
-  "library.filter.reading": "Reading",
   "library.firstBook.browse": "Or browse free classics",
   "library.firstBook.copy": "Add a book you already want to finish. Tap any word while you read to translate it and save it to your vocabulary.",
   "library.firstBook.guestBrowse": "Browse free books",
@@ -223,7 +206,6 @@
   "library.loadFailed.body": "Something went wrong on our side. Your books are safe.",
   "library.loadFailed.title": "Couldn't load your library",
   "library.loading": "Loading...",
-  "library.noUploads": "No uploaded books yet.",
   "library.offline.body": "Your library will be here as soon as you reconnect.",
   "library.offline.partial": "You're offline — showing downloaded books only.",
   "library.offline.title": "You're offline",
@@ -234,11 +216,9 @@
   "library.resume.continue": "Continue",
   "library.resume.percentComplete": "{percent}% complete",
   "library.resume.start": "Start reading",
-  "library.saved": "Saved",
   "library.search.clear": "Clear search",
   "library.search.empty": "No books match \"{query}\"",
   "library.search.placeholder": "Search your library…",
-  "library.search.shortcut": "Cmd+F to focus",
   "library.shelves.continueReading.subtitle": "Pick up where you left off",
   "library.shelves.continueReading.title": "Continue reading",
   "library.shelves.empty.browseCatalog": "Browse catalog",
@@ -266,17 +246,8 @@
   "library.sort.progress": "Most read",
   "library.sort.recent": "Last read",
   "library.sort.title": "Title (A→Z)",
-  "library.sortBy": "Sort by",
-  "library.sortProgress": "Progress",
-  "library.sortRecent": "Recently Added",
-  "library.sortTitle": "Title",
   "library.status.all": "All",
   "library.status.ariaLabel": "Filter by status",
-  "library.status.empty.all": "No books match this filter",
-  "library.status.empty.failed": "These uploads need attention",
-  "library.status.empty.finished": "Finish your first book this month",
-  "library.status.empty.notStarted": "Looking good — you're on top of your library",
-  "library.status.empty.reading": "Open a book to start reading",
   "library.status.failed": "Failed",
   "library.status.finished": "Finished",
   "library.status.notStarted": "Not started",
@@ -289,8 +260,6 @@
   "library.timeMinAgo": "min ago",
   "library.timeYesterday": "yesterday",
   "library.title": "My Library",
-  "library.uploadHint": "Click the + button to upload EPUB or PDF files.",
-  "library.uploads": "Uploads",
   "library.view.done": "Done",
   "library.view.grid": "Grid",
   "library.view.layout": "Layout",
@@ -301,27 +270,13 @@
   "library.view.source": "Show",
   "library.view.title": "View",
   "nav.about": "About",
-  "nav.browseBooks": "Browse all books",
   "nav.catalog": "Catalog",
   "nav.discover": "Discover",
   "nav.library": "Library",
   "nav.profile": "Profile",
-  "nav.read": "Read",
-  "nav.stats": "Stats",
   "nav.vocabulary": "Vocabulary",
-  "onboarding.chooseLanguage": "Choose your language",
-  "onboarding.chooseLanguageSubtitle": "You can change this later in settings",
-  "onboarding.gotIt": "Got it",
-  "onboarding.learnByReading": "Learn by reading",
   "onboarding.nativeLanguageSubtitle": "We'll translate into it while you read. You can change it any time in Profile.",
   "onboarding.nativeLanguageTitle": "What language do you know best?",
-  "onboarding.next": "Next",
-  "onboarding.ready": "You're ready!",
-  "onboarding.readySubtitle": "Saved words appear in your vocabulary\nfor spaced repetition review",
-  "onboarding.save": "Save",
-  "onboarding.saveWords": "Save words to build your vocabulary",
-  "onboarding.skip": "Skip",
-  "onboarding.tapToTranslate": "Tap any word to see its translation",
   "privacy.aiBody1": "They are optional. If you do not use Book Chat, the tutor, the librarian, Explain or translation, nothing is sent to OpenAI.",
   "privacy.aiBody2": "AI output can be wrong. Explanations, translations and answers about a book are generated by a language model and should not be relied on as fact.",
   "privacy.aiBody3": "We do not train models on your content, and under OpenAI's API terms neither do they. We do keep a sample of prompts and responses, as described above, for quality and cost monitoring.",
@@ -387,7 +342,6 @@
   "profile.vocabReminder.permissionDeniedTitle": "Notifications off",
   "profile.vocabReminder.unavailableBody": "Reminders aren't available in this build. Install the latest app version to enable them.",
   "profile.vocabReminder.unavailableTitle": "Not available",
-  "reader.ask.askAboutThis": "Ask about this",
   "reader.ask.clearChat": "Clear chat",
   "reader.ask.clearConfirm": "Clear this chat? This can't be undone.",
   "reader.ask.detachQuote": "Remove quoted passage",
@@ -415,7 +369,6 @@
   "reader.coachmarkDismiss": "Got it",
   "reader.coachmarkSubtitle": "Press and hold a word to see its translation, then tap Save to add it to your vocabulary. Tap the page to show or hide the toolbars.",
   "reader.coachmarkTitle": "Press and hold a word",
-  "reader.later": "Later",
   "reader.ownBookAsk.body": "Long-press, translate, save, review — it all works the same on an EPUB or PDF of your own. Those are the books you'll actually finish.",
   "reader.ownBookAsk.cta": "Add my own book",
   "reader.ownBookAsk.dismiss": "Not now",
@@ -424,11 +377,8 @@
   "reader.rareWordNotice.cta": "Add to SRS anyway",
   "reader.rareWordNotice.ctaBusy": "Adding…",
   "reader.rareWordNotice.title": "Rare word — saved to reference",
-  "reader.reviewNow": "Review Now",
   "reader.timeLeft.hours": "{hours} hr left",
   "reader.timeLeft.hoursMinutes": "{hours} hr {minutes} min left",
-  "reader.timeLeft.inBook": "left in book",
-  "reader.timeLeft.inChapter": "left in chapter",
   "reader.timeLeft.minutes": "{minutes} min left",
   "reader.timeLeft.under": "Less than a minute left",
   "reader.toastTapToReview": "Tap to review",
@@ -438,18 +388,11 @@
   "reader.vocab.addedToSrs": "Added to your vocabulary",
   "reader.vocab.queuedForTomorrow": "Daily cap reached — queued for tomorrow",
   "reader.vocab.saveNeedsAccount": "Saving words needs an account — this one wasn't kept. Sign in from Profile.",
-  "reader.vocab.savedToReference": "Saved to reference (rare word)",
   "reader.vocab.tapAgainToStudy": "Tap again to study ({n} left)",
-  "reader.wordsSaved": "{count} word(s) saved",
-  "review.dayStreak": "{count} day streak",
-  "review.excellent": "Excellent!",
-  "review.greatWork": "Great work!",
-  "review.keepPracticing": "Keep practicing!",
   "search.chapter": "Chapter",
   "search.clearAll": "Clear all",
   "search.enterQuery": "Enter a search query",
   "search.foundEditions": "Found {total} books",
-  "search.foundResults": "Found {total} results",
   "search.hideChapters": "Hide chapters",
   "search.moreChapters": "+{count} more chapters",
   "search.next": "Next →",
@@ -467,7 +410,6 @@
   "stats.achievements": "Achievements",
   "stats.allTime": "All Time",
   "stats.authors": "Most Read Authors",
-  "stats.avgDaily": "Avg Daily",
   "stats.avgTimeToFinish": "Avg Days to Finish",
   "stats.avgWpm": "Avg Words/Min",
   "stats.bookLength": "Book Length",
@@ -482,15 +424,11 @@
   "stats.details": "Details",
   "stats.emptySubtitle": "Start reading a book to track your progress",
   "stats.emptyTitle": "No reading stats yet",
-  "stats.fast": "Fast",
   "stats.genres": "Genres",
   "stats.goalMet": "Goal met!",
-  "stats.goalSettings": "Goal Settings",
   "stats.hours": "Hours",
   "stats.languages": "Languages",
-  "stats.long": "Long",
   "stats.longestStreak": "Longest Streak",
-  "stats.medium": "Medium",
   "stats.noBookStats": "No book stats yet",
   "stats.noData": "No data yet",
   "stats.pace": "Pace",
@@ -498,10 +436,7 @@
   "stats.readingTimeByAuthor": "Reading Time by Author",
   "stats.readingTimeByGenre": "Reading Time by Genre",
   "stats.saveGoal": "Save",
-  "stats.short": "Short",
   "stats.signInPrompt": "Sign in to track your reading and unlock achievements.",
-  "stats.slow": "Slow",
-  "stats.streakCalendar": "Reading Activity",
   "stats.streakThreshold": "Min minutes for streak",
   "stats.streaks": "Streaks",
   "stats.summary": "Summary",
@@ -572,47 +507,26 @@
   "tutor.summary.done": "Session complete",
   "tutor.summary.studied": "Studied",
   "tutor.title": "Smart session",
-  "vocabulary.alreadySaved": "Already saved",
   "vocabulary.banner.budgetReached": "Weekly goal reached. See you next week!",
   "vocabulary.clusters.bonusCta": "Bonus: {n} related words",
   "vocabulary.clusters.fromBook": "from {book}",
   "vocabulary.clusters.start": "Start bonus",
-  "vocabulary.definition": "Definition",
   "vocabulary.dueDate": "Due",
-  "vocabulary.dueToday": "Due today",
   "vocabulary.editTranslation": "Edit translation",
   "vocabulary.empty": "No words saved yet. Select words while reading to add them.",
-  "vocabulary.filters.all": "All",
-  "vocabulary.filters.learning": "Learning",
-  "vocabulary.filters.mastered": "Mastered",
-  "vocabulary.filters.new": "New",
   "vocabulary.filters.search": "Search words...",
-  "vocabulary.learning": "Learning",
   "vocabulary.mastered": "Mastered",
-  "vocabulary.noReviewDue": "No words due for review!",
   "vocabulary.offline.body": "Your saved words will be here as soon as you reconnect.",
   "vocabulary.practice.cta": "Practice anyway",
-  "vocabulary.practice.subtitle": "Doesn't affect your SRS schedule",
   "vocabulary.practice.title": "Practice",
-  "vocabulary.retired.subtitle": "Graduated from review. Tap to bring back.",
-  "vocabulary.retired.title": "Mastered — retired",
-  "vocabulary.retired.unretire": "Bring back to review",
   "vocabulary.review.backToVocab": "Back to Vocabulary",
-  "vocabulary.review.check": "Check",
-  "vocabulary.review.chooseTranslation": "Choose the correct translation",
-  "vocabulary.review.closeEnough": "Close enough!",
   "vocabulary.review.correct": "Correct!",
   "vocabulary.review.correctAnswer": "Correct answer",
   "vocabulary.review.correctRate": "Correct rate",
-  "vocabulary.review.fillBlank": "What word fills the blank?",
   "vocabulary.review.fromBook": "from \"{title}\"",
   "vocabulary.review.next": "Next",
-  "vocabulary.review.promoted": "Level up!",
   "vocabulary.review.reviewed": "Reviewed",
-  "vocabulary.review.sessionComplete": "Session complete!",
-  "vocabulary.review.title": "Vocabulary Review",
   "vocabulary.review.wrong": "Not quite",
-  "vocabulary.saveWord": "Save word",
   "vocabulary.settings.autoRetire": "Auto-retire mastered words",
   "vocabulary.settings.autoRetireHint": "Stop reviewing words you've answered correctly 3× at long intervals.",
   "vocabulary.settings.autoSpeak": "Say the word on a card",
@@ -634,25 +548,11 @@
   "vocabulary.sort.due": "Due date",
   "vocabulary.sort.recent": "Recent",
   "vocabulary.sort.stage": "Stage",
-  "vocabulary.source": "Source",
-  "vocabulary.stage": "Stage",
-  "vocabulary.stages.0": "New",
-  "vocabulary.stages.1": "Recognition",
-  "vocabulary.stages.2": "Recall",
-  "vocabulary.stages.3": "Context",
-  "vocabulary.stages.4": "Mastered",
-  "vocabulary.startReview": "Start Review",
-  "vocabulary.stats.correctRate": "Correct rate",
-  "vocabulary.stats.reviewedToday": "Reviewed today",
   "vocabulary.stats.streak": "Review streak",
   "vocabulary.title": "Vocabulary",
   "vocabulary.totalWords": "Total words",
-  "vocabulary.translation": "Translation",
   "vocabulary.weeklyBudget.backToReading": "Back to reading",
   "vocabulary.weeklyBudget.emptyStateSubtitle": "You've hit your weekly review target. Read — new reviews unlock as old ones age out.",
   "vocabulary.weeklyBudget.label": "This week",
-  "vocabulary.weeklyBudget.progress": "{used} / {budget}",
-  "vocabulary.weeklyBudget.remaining": "{n} left this week",
-  "vocabulary.word": "Word",
-  "vocabulary.wordSaved": "Word saved"
+  "vocabulary.weeklyBudget.progress": "{used} / {budget}"
 }
diff --git a/apps/web/src/locales/__tests__/__fixtures__/web-catalog.golden.json b/apps/web/src/locales/__tests__/__fixtures__/web-catalog.golden.json
index ef1f9c1d..cae56992 100644
--- a/apps/web/src/locales/__tests__/__fixtures__/web-catalog.golden.json
+++ b/apps/web/src/locales/__tests__/__fixtures__/web-catalog.golden.json
@@ -21,13 +21,7 @@
   "about.techStackLabel": "Stack",
   "about.techStackValue": "ASP.NET Core 10 · PostgreSQL 16 · React 19 · React Native (Expo) · Ollama (Gemma 4) · OpenAI gpt-4.1-nano · Docker · Cloudflare Tunnel",
   "about.title": "About",
-  "addMenu.ariaLabel": "Add content menu",
   "addMenu.browseAll": "Browse all books",
-  "addMenu.browserExtension": "Browser extension",
-  "addMenu.comingSoon": "Coming in a future update",
-  "addMenu.emailBook": "Email a book",
-  "addMenu.mobileApps": "Mobile apps",
-  "addMenu.pasteUrl": "Paste URL",
   "addMenu.title": "Add to library",
   "addMenu.uploadFile": "Upload file",
   "androidBeta.badgeAction": "Join the beta",
@@ -54,7 +48,6 @@
   "bookDetail.backToBooks": "Back to Books",
   "bookDetail.backToHome": "Back to Home",
   "bookDetail.browseAll": "Browse all books",
-  "bookDetail.chaptersHeading": "Chapters",
   "bookDetail.continueReading": "Continue Reading",
   "bookDetail.downloadEpub": "Download EPUB",
   "bookDetail.downloadForOffline": "Download for offline",
@@ -338,7 +331,6 @@
   "home.features.upload.description": "Upload EPUB or PDF. Read your books with the full TextStack Reader toolkit.",
   "home.features.upload.title": "Your own books",
   "home.hero.brandLine": "TextStack — a reader for developers, students, and curious minds.",
-  "home.hero.cta": "Browse catalog",
   "home.hero.ctaPrimary": "Start reading",
   "home.hero.ctaReturning": "Continue where you left off",
   "home.hero.ctaSecondary": "Upload your book",
@@ -346,7 +338,6 @@
   "home.hero.searchPlaceholder": "Search by title, author, or genre...",
   "home.hero.seoDescription": "Finish the tech book, paper, or classic you keep quitting. Contextual word explanations tied to the book's domain. Capped weekly SRS, offline reading. EPUB, PDF.",
   "home.hero.seoTitle": "TextStack — A reader that helps you finish dense books",
-  "home.hero.subtitle": "Read classic literature. Build vocabulary. Track your progress.",
   "home.hero.subtitleAfter": "— stay in flow, finish the book.",
   "home.hero.subtitleBefore": "Tap any word for a contextual explanation in",
   "home.hero.title": "Finish the book you keep quitting.",
@@ -360,7 +351,6 @@
   "home.howItWorks.step3Title": "Master with flashcards",
   "home.recentAuthors.title": "Recently Added Authors",
   "home.recentAuthors.viewAll": "View all authors",
-  "home.recentBooks.read": "Read",
   "home.recentBooks.title": "Recently Added Books",
   "home.recentBooks.viewAll": "View all books",
   "home.recommended.subtitle": "Free, public-domain books — thousands ready to read.",
@@ -423,12 +413,10 @@
   "library.actions.confirmDeleteTitle": "Delete this book?",
   "library.actions.delete": "Delete",
   "library.actions.deleting": "Deleting…",
-  "library.actions.downloadOriginal": "Download original",
   "library.actions.editMetadata": "Edit metadata",
   "library.actions.markFinished": "Mark as finished",
   "library.actions.markUnfinished": "Mark as unfinished",
   "library.actions.menu": "Options",
-  "library.actions.open": "Open",
   "library.actions.removeFromLibrary": "Remove from library",
   "library.actions.retry": "Re-process",
   "library.actions.retrying": "Retrying…",
@@ -497,14 +485,9 @@
   "library.estimate.fromYourPace": "Based on your reading pace",
   "library.estimate.left": "{{time}} left",
   "library.failed": "Failed",
-  "library.failedToProcess": "Failed to process",
-  "library.filter.all": "All",
   "library.filter.clear": "Clear filter",
   "library.filter.empty": "No books match this filter",
-  "library.filter.failed": "Failed",
   "library.filter.finished": "Finished",
-  "library.filter.notStarted": "Not started",
-  "library.filter.reading": "Reading",
   "library.firstBook.browse": "Or browse free classics",
   "library.firstBook.copy": "Add a book you already want to finish. Tap any word while you read to translate it and save it to your vocabulary.",
   "library.firstBook.guestBrowse": "Browse free books",
@@ -519,7 +502,6 @@
   "library.loadFailed.body": "Something went wrong on our side. Your books are safe.",
   "library.loadFailed.title": "Couldn't load your library",
   "library.loading": "Loading...",
-  "library.noUploads": "No uploaded books yet.",
   "library.offline.body": "Your library will be here as soon as you reconnect.",
   "library.offline.partial": "You're offline — showing downloaded books only.",
   "library.offline.title": "You're offline",
@@ -563,12 +545,10 @@
   "library.resume.continue": "Continue",
   "library.resume.percentComplete": "{percent}% complete",
   "library.resume.start": "Start reading",
-  "library.saved": "Saved",
   "library.search.clear": "Clear search",
   "library.search.contentToggle": "Search inside books",
   "library.search.empty": "No books match \"{query}\"",
   "library.search.placeholder": "Search your library…",
-  "library.search.shortcut": "Cmd+F to focus",
   "library.shelves.continueReading.subtitle": "Pick up where you left off",
   "library.shelves.continueReading.title": "Continue reading",
   "library.shelves.empty.browseCatalog": "Browse catalog",
@@ -597,10 +577,6 @@
   "library.sort.progress": "Progress (most read)",
   "library.sort.recent": "Recently opened",
   "library.sort.title": "Title (A→Z)",
-  "library.sortBy": "Sort by",
-  "library.sortProgress": "Progress",
-  "library.sortRecent": "Recently Added",
-  "library.sortTitle": "Title",
   "library.statsHeader.booksSuffix": "books",
   "library.statsHeader.booksYtd": "Books finished YTD",
   "library.statsHeader.collapse": "Hide stats",
@@ -619,11 +595,6 @@
   "library.statsHeader.yearlyGoal": "Year's goal",
   "library.status.all": "All",
   "library.status.ariaLabel": "Filter by status",
-  "library.status.empty.all": "No books match this filter",
-  "library.status.empty.failed": "These uploads need attention",
-  "library.status.empty.finished": "Finish your first book this month",
-  "library.status.empty.notStarted": "Looking good — you're on top of your library",
-  "library.status.empty.reading": "Open a book to start reading",
   "library.status.failed": "Failed",
   "library.status.finished": "Finished",
   "library.status.notStarted": "Not started",
@@ -647,8 +618,6 @@
   "library.timeMinAgo": "min ago",
   "library.timeYesterday": "yesterday",
   "library.title": "My Library",
-  "library.uploadHint": "Click the + button to upload EPUB or PDF files.",
-  "library.uploads": "Uploads",
   "library.view.done": "Done",
   "library.view.grid": "Grid",
   "library.view.layout": "Layout",
@@ -704,7 +673,6 @@
   "nav.aboutTextStack": "About TextStack Reader",
   "nav.books": "Books",
   "nav.brandTitle": "TextStack Reader - Learn languages through reading",
-  "nav.browseBooks": "Browse all books",
   "nav.browseGenres": "Browse genres",
   "nav.catalog": "Catalog",
   "nav.discover": "Discover",
@@ -721,25 +689,12 @@
   "nav.highlights": "Highlights",
   "nav.library": "Library",
   "nav.profile": "Profile",
-  "nav.read": "Read",
   "nav.search": "Search",
-  "nav.stats": "Stats",
   "nav.vocabulary": "Vocabulary",
-  "onboarding.chooseLanguage": "Choose your language",
-  "onboarding.chooseLanguageSubtitle": "You can change this later in settings",
   "onboarding.ghostHintLabel": "Tap any word",
-  "onboarding.gotIt": "Got it",
   "onboarding.hintLabel": "Try tapping a word",
-  "onboarding.learnByReading": "Learn by reading",
   "onboarding.nativeLanguageSubtitle": "We'll translate into it while you read. You can change it any time in Profile.",
   "onboarding.nativeLanguageTitle": "What language do you know best?",
-  "onboarding.next": "Next",
-  "onboarding.ready": "You're ready!",
-  "onboarding.readySubtitle": "Saved words appear in your vocabulary\nfor spaced repetition review",
-  "onboarding.save": "Save",
-  "onboarding.saveWords": "Save words to build your vocabulary",
-  "onboarding.skip": "Skip",
-  "onboarding.tapToTranslate": "Tap any word to see its translation",
   "palette.empty": "Nothing matches that.",
   "palette.groups.actions": "Actions",
   "palette.groups.books": "Books",
@@ -826,7 +781,6 @@
   "profile.vocabReminder.permissionDeniedTitle": "Notifications off",
   "profile.vocabReminder.unavailableBody": "Reminders aren't available in this build. Install the latest app version to enable them.",
   "profile.vocabReminder.unavailableTitle": "Not available",
-  "reader.ask.askAboutThis": "Ask about this",
   "reader.ask.citation": "ch.{{ch}}",
   "reader.ask.citationFallback": "source",
   "reader.ask.citationPage": "p. {{page}}",
@@ -872,7 +826,6 @@
   "reader.image.reset": "Reset zoom",
   "reader.image.zoomIn": "Zoom in",
   "reader.image.zoomOut": "Zoom out",
-  "reader.later": "Later",
   "reader.noteEditor.cancel": "Cancel",
   "reader.noteEditor.close": "Close",
   "reader.noteEditor.deleteHighlight": "Delete highlight",
@@ -900,7 +853,6 @@
   "reader.rareWordNotice.cta": "Add to SRS anyway",
   "reader.rareWordNotice.ctaBusy": "Adding…",
   "reader.rareWordNotice.title": "Rare word — saved to reference",
-  "reader.reviewNow": "Review Now",
   "reader.selectionToolbar.askAboutThis": "Ask about this",
   "reader.selectionToolbar.copy": "Copy selected text",
   "reader.selectionToolbar.explain": "Explain in context",
@@ -919,8 +871,6 @@
   "reader.studyBuddy.title": "Help me understand this",
   "reader.timeLeft.hours": "{hours} hr left",
   "reader.timeLeft.hoursMinutes": "{hours} hr {minutes} min left",
-  "reader.timeLeft.inBook": "left in book",
-  "reader.timeLeft.inChapter": "left in chapter",
   "reader.timeLeft.minutes": "{minutes} min left",
   "reader.timeLeft.under": "Less than a minute left",
   "reader.toastTapToReview": "Tap to review",
@@ -932,7 +882,6 @@
   "reader.vocab.addedToSrs": "Added to your vocabulary",
   "reader.vocab.queuedForTomorrow": "Daily cap reached — queued for tomorrow",
   "reader.vocab.saveNeedsAccount": "Saving words needs an account — this one wasn't kept. Sign in from Profile.",
-  "reader.vocab.savedToReference": "Saved to reference (rare word)",
   "reader.vocab.tapAgainToStudy": "Tap again to study ({{n}} left)",
   "reader.wordPopup.allLanguages": "All languages",
   "reader.wordPopup.change": "Change",
@@ -953,16 +902,10 @@
   "reader.wordPopup.searchLanguage": "Search language...",
   "reader.wordPopup.translateTo": "Translate to...",
   "reader.wordPopup.translatingTo": "Translating to",
-  "reader.wordsSaved": "{count} word(s) saved",
-  "review.dayStreak": "{count} day streak",
-  "review.excellent": "Excellent!",
-  "review.greatWork": "Great work!",
-  "review.keepPracticing": "Keep practicing!",
   "search.chapter": "Chapter",
   "search.clearAll": "Clear all",
   "search.enterQuery": "Enter a search query",
   "search.foundEditions": "Found {total} books",
-  "search.foundResults": "Found {total} results",
   "search.hideChapters": "Hide chapters",
   "search.moreChapters": "+{count} more chapters",
   "search.next": "Next →",
@@ -996,7 +939,6 @@
   "stats.achievements": "Achievements",
   "stats.allTime": "All Time",
   "stats.authors": "Most Read Authors",
-  "stats.avgDaily": "Avg Daily",
   "stats.avgTimeToFinish": "Avg Days to Finish",
   "stats.avgWpm": "Avg Words/Min",
   "stats.bookLength": "Book Length",
@@ -1017,15 +959,11 @@
   "stats.empty.title": "Your reading stats will appear here",
   "stats.emptySubtitle": "Start reading a book to track your progress",
   "stats.emptyTitle": "No reading stats yet",
-  "stats.fast": "Fast",
   "stats.genres": "Genres",
   "stats.goalMet": "Goal met!",
-  "stats.goalSettings": "Goal Settings",
   "stats.hours": "Hours",
   "stats.languages": "Languages",
-  "stats.long": "Long",
   "stats.longestStreak": "Longest Streak",
-  "stats.medium": "Medium",
   "stats.noBookStats": "No book stats yet",
   "stats.noData": "No data yet",
   "stats.overview": "Overview",
@@ -1034,10 +972,7 @@
   "stats.readingTimeByAuthor": "Reading Time by Author",
   "stats.readingTimeByGenre": "Reading Time by Genre",
   "stats.saveGoal": "Save",
-  "stats.short": "Short",
   "stats.signInPrompt": "Sign in to track your reading and unlock achievements.",
-  "stats.slow": "Slow",
-  "stats.streakCalendar": "Reading Activity",
   "stats.streakThreshold": "Min minutes for streak",
   "stats.streaks": "Streaks",
   "stats.summary": "Summary",
@@ -1145,7 +1080,6 @@
   "userBook.enrichRetry": "Retry",
   "userBook.enriching": "Generating book details…",
   "userMenu.anonymousReader": "Anonymous reader",
-  "vocabulary.alreadySaved": "Already saved",
   "vocabulary.banner.budgetReached": "Weekly goal reached. See you next week!",
   "vocabulary.banner.dayStreak": "day streak",
   "vocabulary.banner.dueWaiting": "{n} words waiting for review",
@@ -1168,7 +1102,6 @@
   "vocabulary.columns.progress": "Progress",
   "vocabulary.columns.translation": "Translation",
   "vocabulary.columns.word": "Word",
-  "vocabulary.definition": "Definition",
   "vocabulary.deleteAll": "Delete all words",
   "vocabulary.deleteAllConfirm": "Click to confirm — cannot be undone",
   "vocabulary.deleteConfirm": "Remove",
@@ -1180,22 +1113,16 @@
   "vocabulary.due.today": "Today",
   "vocabulary.due.tomorrow": "Tomorrow",
   "vocabulary.dueDate": "Due",
-  "vocabulary.dueToday": "Due today",
   "vocabulary.editTranslation": "Edit translation",
   "vocabulary.empty": "No words saved yet. Select words while reading to add them.",
   "vocabulary.emptyPage.cta": "Browse library",
   "vocabulary.emptyPage.subtitle": "Open any book, tap a word — it will appear here ready for review.",
   "vocabulary.emptyPage.title": "Your vocabulary starts here",
-  "vocabulary.filters.all": "All",
-  "vocabulary.filters.learning": "Learning",
   "vocabulary.filters.lookups": "Reference",
-  "vocabulary.filters.mastered": "Mastered",
-  "vocabulary.filters.new": "New",
   "vocabulary.filters.pending": "Pending",
   "vocabulary.filters.search": "Search words...",
   "vocabulary.fromBook": "from {title}",
   "vocabulary.interval": "Next interval: {n} days",
-  "vocabulary.learning": "Learning",
   "vocabulary.listCount": "{n} words",
   "vocabulary.listTitle": "My vocabulary",
   "vocabulary.loadMore": "Load more",
@@ -1208,7 +1135,6 @@
   "vocabulary.lookups.promoteFailed": "Could not promote this word. Try again.",
   "vocabulary.lookups.taps": "{n} taps",
   "vocabulary.mastered": "Mastered",
-  "vocabulary.noReviewDue": "No words due for review!",
   "vocabulary.offline.body": "Your saved words will be here as soon as you reconnect.",
   "vocabulary.pending.dailyStatus": "Today: {used}/{cap} new words in SRS",
   "vocabulary.pending.dismiss": "Dismiss",
@@ -1222,26 +1148,18 @@
   "vocabulary.practice.flashcards": "Flashcards",
   "vocabulary.practice.length": "Length",
   "vocabulary.practice.mode": "Mode",
-  "vocabulary.practice.subtitle": "Doesn't affect your SRS schedule",
   "vocabulary.practice.title": "Practice",
   "vocabulary.practice.wordsUnit": "words",
-  "vocabulary.retired.subtitle": "Graduated from review. Tap to bring back.",
-  "vocabulary.retired.title": "Mastered — retired",
-  "vocabulary.retired.unretire": "Bring back to review",
   "vocabulary.review.almost": "Almost",
   "vocabulary.review.backToVocab": "Back to Vocabulary",
   "vocabulary.review.blitz": "Blitz",
-  "vocabulary.review.check": "Check",
-  "vocabulary.review.chooseTranslation": "Choose the correct translation",
   "vocabulary.review.classic": "Classic",
-  "vocabulary.review.closeEnough": "Close enough!",
   "vocabulary.review.continue": "Continue",
   "vocabulary.review.correct": "Correct!",
   "vocabulary.review.correctAnswer": "Correct answer",
   "vocabulary.review.correctRate": "Correct rate",
   "vocabulary.review.didYouRemember": "Did you remember?",
   "vocabulary.review.excellent": "Excellent!",
-  "vocabulary.review.fillBlank": "What word fills the blank?",
   "vocabulary.review.forgot": "Forgot",
   "vocabulary.review.fromBook": "from \"{title}\"",
   "vocabulary.review.greatWork": "Great work!",
@@ -1257,18 +1175,14 @@
   "vocabulary.review.practiceAgain": "Practice Again",
   "vocabulary.review.practiceMode": "Practice Mode",
   "vocabulary.review.practiceNote": "Correct answers don't change your review schedule.",
-  "vocabulary.review.promoted": "Level up!",
   "vocabulary.review.reviewDue": "Review Due Words",
   "vocabulary.review.reviewed": "Reviewed",
-  "vocabulary.review.sessionComplete": "Session complete!",
   "vocabulary.review.soundOff": "Sound off",
   "vocabulary.review.soundOn": "Sound on",
   "vocabulary.review.startAgain": "Start Again",
   "vocabulary.review.tapToFlip": "Tap to flip",
-  "vocabulary.review.title": "Vocabulary Review",
   "vocabulary.review.wordsReviewed": "words",
   "vocabulary.review.wrong": "Not quite",
-  "vocabulary.saveWord": "Save word",
   "vocabulary.settings.autoRetire": "Auto-retire mastered words",
   "vocabulary.settings.autoRetireHint": "Stop reviewing words you've answered correctly 3× at long intervals.",
   "vocabulary.settings.autoSpeak": "Say the word on a card",
@@ -1290,30 +1204,16 @@
   "vocabulary.sort.due": "Due date",
   "vocabulary.sort.recent": "Recent",
   "vocabulary.sort.stage": "Stage",
-  "vocabulary.source": "Source",
   "vocabulary.srsHint": "Spaced repetition — each word returns when it's due for review.",
-  "vocabulary.stage": "Stage",
-  "vocabulary.stages.0": "New",
-  "vocabulary.stages.1": "Recognition",
-  "vocabulary.stages.2": "Recall",
-  "vocabulary.stages.3": "Context",
-  "vocabulary.stages.4": "Mastered",
   "vocabulary.startPractice": "Practice",
-  "vocabulary.startReview": "Start Review",
-  "vocabulary.stats.correctRate": "Correct rate",
   "vocabulary.stats.practicedToday": "Practiced today",
-  "vocabulary.stats.reviewedToday": "Reviewed today",
   "vocabulary.stats.streak": "Review streak",
   "vocabulary.title": "Vocabulary",
   "vocabulary.totalWords": "Total words",
-  "vocabulary.translation": "Translation",
   "vocabulary.weeklyBudget.backToReading": "Back to reading",
   "vocabulary.weeklyBudget.emptyStateSubtitle": "You've hit your weekly review target. Read — new reviews unlock as old ones age out.",
   "vocabulary.weeklyBudget.label": "This week",
   "vocabulary.weeklyBudget.progress": "{used} / {budget}",
-  "vocabulary.weeklyBudget.remaining": "{n} left this week",
-  "vocabulary.word": "Word",
-  "vocabulary.wordSaved": "Word saved",
   "words.tabs.highlights": "Highlights",
   "words.tabs.vocabulary": "Vocabulary"
 }
diff --git a/packages/shared/src/i18n/en.json b/packages/shared/src/i18n/en.json
index 72cca5d3..70de22ba 100644
--- a/packages/shared/src/i18n/en.json
+++ b/packages/shared/src/i18n/en.json
@@ -73,18 +73,13 @@
     }
   },
   "home": {
-    "hero": {
-      "subtitle": "Read classic literature. Build vocabulary. Track your progress.",
-      "cta": "Browse catalog"
-    },
     "recentAuthors": {
       "title": "Recently Added Authors",
       "viewAll": "View all authors"
     },
     "recentBooks": {
       "title": "Recently Added Books",
-      "viewAll": "View all books",
-      "read": "Read"
+      "viewAll": "View all books"
     }
   },
   "firstRun": {
@@ -110,28 +105,14 @@
   "nav": {
     "catalog": "Catalog",
     "library": "Library",
-    "stats": "Stats",
     "vocabulary": "Vocabulary",
     "about": "About",
-    "browseBooks": "Browse all books",
-    "read": "Read",
     "discover": "Discover",
     "profile": "Profile"
   },
   "onboarding": {
-    "chooseLanguage": "Choose your language",
-    "chooseLanguageSubtitle": "You can change this later in settings",
     "nativeLanguageTitle": "What language do you know best?",
-    "nativeLanguageSubtitle": "We'll translate into it while you read. You can change it any time in Profile.",
-    "learnByReading": "Learn by reading",
-    "tapToTranslate": "Tap any word to see its translation",
-    "saveWords": "Save words to build your vocabulary",
-    "save": "Save",
-    "ready": "You're ready!",
-    "readySubtitle": "Saved words appear in your vocabulary\nfor spaced repetition review",
-    "next": "Next",
-    "skip": "Skip",
-    "gotIt": "Got it"
+    "nativeLanguageSubtitle": "We'll translate into it while you read. You can change it any time in Profile."
   },
   "profile": {
     "vocabReminder": {
@@ -203,12 +184,6 @@
   "library": {
     "title": "My Library",
     "signInPrompt": "Sign in to save books to your library and track your reading progress.",
-    "saved": "Saved",
-    "uploads": "Uploads",
-    "sortRecent": "Recently Added",
-    "sortTitle": "Title",
-    "sortProgress": "Progress",
-    "sortBy": "Sort by",
     "loading": "Loading...",
     "emptyLibrary": "Your library is empty.",
     "browseBooks": "Browse Books",
@@ -229,14 +204,11 @@
     "chapters": "chapters",
     "processing": "Processing...",
     "failed": "Failed",
-    "noUploads": "No uploaded books yet.",
-    "uploadHint": "Click the + button to upload EPUB or PDF files.",
     "timeJustNow": "just now",
     "timeMinAgo": "min ago",
     "timeHoursAgo": "hours ago",
     "timeYesterday": "yesterday",
     "timeDaysAgo": "days ago",
-    "failedToProcess": "Failed to process",
     "sidebar": {
       "all": "All books",
       "uploads": "My uploads",
@@ -286,11 +258,7 @@
       "progress": "Most read"
     },
     "filter": {
-      "all": "All",
-      "reading": "Reading",
       "finished": "Finished",
-      "notStarted": "Not started",
-      "failed": "Failed",
       "empty": "No books match this filter",
       "clear": "Clear filter"
     },
@@ -300,24 +268,15 @@
       "notStarted": "Not started",
       "failed": "Failed",
       "all": "All",
-      "empty": {
-        "reading": "Open a book to start reading",
-        "finished": "Finish your first book this month",
-        "notStarted": "Looking good — you're on top of your library",
-        "failed": "These uploads need attention",
-        "all": "No books match this filter"
-      },
       "ariaLabel": "Filter by status"
     },
     "search": {
       "placeholder": "Search your library…",
       "empty": "No books match \"{query}\"",
-      "clear": "Clear search",
-      "shortcut": "Cmd+F to focus"
+      "clear": "Clear search"
     },
     "actions": {
       "menu": "Options",
-      "open": "Open",
       "viewDetails": "View details",
       "markFinished": "Mark as finished",
       "markUnfinished": "Mark as unfinished",
@@ -326,7 +285,6 @@
       "retrying": "Retrying…",
       "cancel": "Cancel",
       "cancelling": "Cancelling…",
-      "downloadOriginal": "Download original",
       "removeFromLibrary": "Remove from library",
       "addToCollection": "Add to collection",
       "addToCollectionEmpty": "No collections yet — create one below",
@@ -388,13 +346,7 @@
   },
   "addMenu": {
     "title": "Add to library",
-    "ariaLabel": "Add content menu",
-    "comingSoon": "Coming in a future update",
     "uploadFile": "Upload file",
-    "pasteUrl": "Paste URL",
-    "emailBook": "Email a book",
-    "browserExtension": "Browser extension",
-    "mobileApps": "Mobile apps",
     "browseAll": "Browse all books"
   },
   "books": {
@@ -441,7 +393,6 @@
     "downloading": "Downloading {progress}%...",
     "availableOffline": "Available offline",
     "downloadForOffline": "Download for offline",
-    "chaptersHeading": "Chapters",
     "readChapter": "Read {title}",
     "words": "words",
     "viewAllChapters": "View all {count} chapters",
@@ -474,7 +425,6 @@
     "title": "Search",
     "enterQuery": "Enter a search query",
     "noResults": "No results found",
-    "foundResults": "Found {total} results",
     "chapter": "Chapter",
     "readOnline": "Read {title} online",
     "readOnlineFree": "{title} - Read online free",
@@ -555,13 +505,10 @@
     "totalTime": "Total Time",
     "booksFinished": "Books Finished",
     "currentStreak": "Current Streak",
-    "avgDaily": "Avg Daily",
     "dailyGoal": "Daily Goal",
     "goalMet": "Goal met!",
-    "streakCalendar": "Reading Activity",
     "weeklyChart": "This Week",
     "achievements": "Achievements",
-    "goalSettings": "Goal Settings",
     "dailyMinutesTarget": "Daily minutes target",
     "streakThreshold": "Min minutes for streak",
     "saveGoal": "Save",
@@ -588,11 +535,6 @@
     "avgTimeToFinish": "Avg Days to Finish",
     "readingTimeByGenre": "Reading Time by Genre",
     "readingTimeByAuthor": "Reading Time by Author",
-    "slow": "Slow",
-    "medium": "Medium",
-    "fast": "Fast",
-    "short": "Short",
-    "long": "Long",
     "noData": "No data yet",
     "emptyTitle": "No reading stats yet",
     "emptySubtitle": "Start reading a book to track your progress",
@@ -661,7 +603,6 @@
       "clearConfirm": "Clear this chat? This can't be undone.",
       "loadingHistory": "Loading chat…",
       "detachQuote": "Remove quoted passage",
-      "askAboutThis": "Ask about this",
       "startersTitle": "Try asking",
       "starters": {
         "summary": "Summarize what I've read so far",
@@ -670,9 +611,6 @@
         "attention": "What should I pay attention to?"
       }
     },
-    "reviewNow": "Review Now",
-    "later": "Later",
-    "wordsSaved": "{count} word(s) saved",
     "toastWordAdded": "Added to vocabulary",
     "toastWordAddedCount": "Added · {count} this session",
     "toastTapToReview": "Tap to review",
@@ -687,7 +625,6 @@
     },
     "vocab": {
       "queuedForTomorrow": "Daily cap reached — queued for tomorrow",
-      "savedToReference": "Saved to reference (rare word)",
       "tapAgainToStudy": "Tap again to study ({n} left)",
       "addedToSrs": "Added to your vocabulary",
       "addAnywayFailed": "Couldn't add word — please try again",
@@ -703,49 +640,18 @@
       "under": "Less than a minute left",
       "minutes": "{minutes} min left",
       "hours": "{hours} hr left",
-      "hoursMinutes": "{hours} hr {minutes} min left",
-      "inChapter": "left in chapter",
-      "inBook": "left in book"
+      "hoursMinutes": "{hours} hr {minutes} min left"
     }
   },
-  "review": {
-    "excellent": "Excellent!",
-    "greatWork": "Great work!",
-    "keepPracticing": "Keep practicing!",
-    "dayStreak": "{count} day streak"
-  },
   "vocabulary": {
     "title": "Vocabulary",
     "signInPrompt": "Sign in to build your personal vocabulary list.",
     "empty": "No words saved yet. Select words while reading to add them.",
-    "saveWord": "Save word",
-    "wordSaved": "Word saved",
-    "alreadySaved": "Already saved",
-    "startReview": "Start Review",
-    "dueToday": "Due today",
     "totalWords": "Total words",
     "mastered": "Mastered",
-    "learning": "Learning",
-    "word": "Word",
-    "translation": "Translation",
-    "definition": "Definition",
-    "stage": "Stage",
-    "source": "Source",
     "dueDate": "Due",
-    "noReviewDue": "No words due for review!",
     "editTranslation": "Edit translation",
-    "stages": {
-      "0": "New",
-      "1": "Recognition",
-      "2": "Recall",
-      "3": "Context",
-      "4": "Mastered"
-    },
     "filters": {
-      "all": "All",
-      "new": "New",
-      "learning": "Learning",
-      "mastered": "Mastered",
       "search": "Search words..."
     },
     "sort": {
@@ -755,31 +661,21 @@
       "stage": "Stage"
     },
     "review": {
-      "title": "Vocabulary Review",
-      "chooseTranslation": "Choose the correct translation",
-      "fillBlank": "What word fills the blank?",
       "correct": "Correct!",
-      "closeEnough": "Close enough!",
       "wrong": "Not quite",
       "correctAnswer": "Correct answer",
       "next": "Next",
-      "sessionComplete": "Session complete!",
       "reviewed": "Reviewed",
       "correctRate": "Correct rate",
-      "promoted": "Level up!",
-      "check": "Check",
       "fromBook": "from \"{title}\"",
       "backToVocab": "Back to Vocabulary"
     },
     "stats": {
-      "reviewedToday": "Reviewed today",
-      "correctRate": "Correct rate",
       "streak": "Review streak"
     },
     "weeklyBudget": {
       "label": "This week",
       "progress": "{used} / {budget}",
-      "remaining": "{n} left this week",
       "emptyStateSubtitle": "You've hit your weekly review target. Read — new reviews unlock as old ones age out.",
       "backToReading": "Back to reading"
     },
@@ -788,13 +684,7 @@
     },
     "practice": {
       "title": "Practice",
-      "cta": "Practice anyway",
-      "subtitle": "Doesn't affect your SRS schedule"
-    },
-    "retired": {
-      "title": "Mastered — retired",
-      "subtitle": "Graduated from review. Tap to bring back.",
-      "unretire": "Bring back to review"
+      "cta": "Practice anyway"
     },
     "clusters": {
       "bonusCta": "Bonus: {n} related words",
diff --git a/packages/shared/src/i18n/unusedKeys.test.ts b/packages/shared/src/i18n/unusedKeys.test.ts
new file mode 100644
index 00000000..1b5f3829
--- /dev/null
+++ b/packages/shared/src/i18n/unusedKeys.test.ts
@@ -0,0 +1,107 @@
+import { describe, it, expect } from 'vitest'
+import { readFileSync, readdirSync, statSync } from 'node:fs'
+import { resolve, join } from 'node:path'
+
+/**
+ * Keys this catalogue carries that neither app renders.
+ *
+ * Nothing checked this before and 100 had accumulated — a whole `review` namespace,
+ * most of `vocabulary`, `onboarding` copy for a flow that changed. They cost bundle
+ * size on a phone and, worse, they read as intent: the next person opening the file
+ * cannot tell which strings are actually shown.
+ *
+ * **It checks BOTH consumers, and that is not a detail.** The web app no longer keeps
+ * its own copy of a shared string, so a key used only by the website lives only here.
+ * A first pass at this test looked at mobile alone and reported 278 orphans; deleting
+ * them removed 244 keys the website renders, and `apps/web/src/locales/__tests__/
+ * missing-keys.test.ts` failed instantly with `Footer.tsx → footer.privacy`. Since
+ * slice 3, "unused by mobile" and "unused" are different questions.
+ *
+ * **The detector is deliberately narrow, because a wrong answer deletes a working
+ * screen.** An earlier general version called `privacy.*` dead — 49 keys behind a
+ * Google Play store-listing URL — because they are reached through a shared list of
+ * key names rather than a literal `t('…')`.
+ *
+ * A key counts as referenced when EITHER the exact dotted path appears quoted
+ * anywhere in either app or here (covering `t('a.b')` and key tables such as
+ * `PRIVACY_SECTIONS`), OR it matches one of the templates below.
+ *
+ * DYNAMIC is the complete set of `` t(`…${…}`) `` shapes in both apps, taken by
+ * grepping for them rather than guessed. Add a new template to an app without adding
+ * it here and this test starts calling live keys dead — loudly, which is the point.
+ */
+const DYNAMIC = [
+  // mobile
+  /^contact\.reachOut\w+$/,
+  /^library\.badge\.\w+$/,
+  /^library\.sort\.\w+$/,
+  /^library\.status\.\w+$/,
+  /^reader\.ask\.starters\.\w+$/,
+  /^terms\.use\w+$/,
+  /^tutor\.exercise\.\w+$/,
+  // web
+  /^home\.comparison\.(competitors|features)\.\w+$/,
+  /^home\.faq\.\w+\.[aq]$/,
+  /^home\.features\.\w+\.(title|description)$/,
+  /^home\.testimonials\.\w+\.(name|quote|role)$/,
+  /^library\.shelves\.\w+\.(title|subtitle)$/,
+  // web's DeviceVerifyPage builds `${ns}.${suffix}` with ns chosen at runtime
+  /^(deviceVerify|connectExtension)\./,
+]
+
+/**
+ * Kept on purpose despite having no reference, `key: 'why'`. Empty today. Asserted by
+ * EQUALITY, so a key that starts being used must also be removed from here — an
+ * allowlist nobody prunes stops meaning anything.
+ */
+const KNOWN_UNREFERENCED: Record<string, string> = {}
+
+const ROOTS = [
+  resolve(__dirname, '..'),                                  // packages/shared/src
+  resolve(__dirname, '../../../../apps/mobile/src'),
+  resolve(__dirname, '../../../../apps/mobile/app'),
+  resolve(__dirname, '../../../../apps/web/src'),
+  resolve(__dirname, '../../../../apps/web/scripts'),
+]
+
+function read(dir: string, out: string[] = []): string[] {
+  for (const entry of readdirSync(dir)) {
+    if (['node_modules', 'dist', '.expo', '__fixtures__', 'locales'].includes(entry)) continue
+    const p = join(dir, entry)
+    let isDir: boolean
+    try { isDir = statSync(p).isDirectory() } catch { continue } // ios/Pods has broken symlinks
+    if (isDir) read(p, out)
+    else if (/\.(ts|tsx|js|mjs)$/.test(entry) && !/\.test\.tsx?$/.test(entry)) out.push(p)
+  }
+  return out
+}
+
+const source = ROOTS.flatMap(d => read(d)).map(p => readFileSync(p, 'utf8')).join('\n')
+
+type Node = Record<string, unknown>
+const flatten = (n: Node, p = '', o: Record<string, unknown> = {}) => {
+  for (const [k, v] of Object.entries(n)) {
+    const q = p ? `${p}.${k}` : k
+    if (v !== null && typeof v === 'object' && !Array.isArray(v)) flatten(v as Node, q, o)
+    else o[q] = v
+  }
+  return o
+}
+
+const catalog = flatten(JSON.parse(readFileSync(resolve(__dirname, 'en.json'), 'utf8')))
+
+describe('shared catalogue has no orphans', () => {
+  it('found both apps', () => {
+    // A walk that silently returns nothing would make every key look dead and this
+    // whole file pass for the worst possible reason.
+    expect(source.length).toBeGreaterThan(500_000)
+  })
+
+  it('every key is reachable from one of the apps, or written down as deliberately not', () => {
+    const unreferenced = Object.keys(catalog).filter(key => {
+      if (["'", '"', '`'].some(q => source.includes(`${q}${key}${q}`))) return false
+      return !DYNAMIC.some(rx => rx.test(key))
+    })
+    expect(unreferenced.sort()).toEqual(Object.keys(KNOWN_UNREFERENCED).sort())
+  })
+})