[KnifeLemon]

What does this change?

Prepares the 2.2.0 release: Directory.Build.props and the bug report template's version placeholder go to 2.2.0, and CHANGELOG.md gets a ## 2.2.0 section above 2.1.0 in the same layout. The release workflow puts that section under "What's Changed".

• Update block: level: recommended, 11 lines each in ko, en, zh, pl, es, hi, ja, ru, ar and pt-BR (the 2.1.0 languages and order), plus de, th and tr, which the app now ships and ReleaseNotes.LanguageOf already maps.
• New / Improved / Fixed: every PR merged into main since v2.1.0 that people using Filee notice, with its issue and its contributor, and where to find it in the app. Slot positions were checked against BuiltInData.cs, and the format count matches the READMEs (268).
• fix(pdf): no space between Chinese or Japanese words of an OCR layer (#691) #703 (OCR spaces between Chinese / Japanese words, [Bug]: Converting PDF to Word may result in formatting errors. #691) is written in although it's still open; it should be merged before tagging.
• Left out: feat(hwp): extend the document model for rendering fidelity #678, feat(hwp): resource limits and fuzzing for the document readers #686, Revert #686 and #678: Project 4 work moves to the builtin-engines branch #688 (taken back out of main), and CI, test, build and docs-only PRs: fix: Donut flip tests: check T5's colours off the label, once the ring is open (#533) #546, CI: give the portable jobs 180 minutes #547, ci: cancel older main runs when a newer push arrives #579, Releases: copy the Windows files to dl.filee.sh too #598, docs(theme): add reusable theme.json palette recipes #619, fix(i18n): publish language strings in one resource change, App tests ~10x faster in CI (#540) #636, docs: add Turkish README (README.tr.md) #673, docs: Microsoft Store badge in the READMEs (#222) #700. docs(linux): turn the KWin script off and on after upgrading it (#557) #657 (INSTALL.txt) is folded into the KDE entry (KWin script: open the donut on the Activity and desktop in use (#557) #610).

No tag and no release. Those come after this is merged.

Type of change

• Bug fix
• New feature or improvement
• New format or engine
• Translation
• Documentation
• Build, CI or dependencies

How was it tested?

• dotnet format --verify-no-changes (no code changed)
• dotnet test: ReleaseNotesTests, WhatsNewTests and UpdateServiceTests in Filee.App.Tests, 131 passed, 1 skipped. No test reads CHANGELOG.md itself.
• dotnet build Filee.slnx -c Release: 0 errors.
• The update block was checked line by line: every line has a key the parser knows, and each language has 11 lines.

Checklist

• New UI strings are in all src/Filee.App/Assets/i18n/*.json files (none)
• New third-party code or binaries are listed in THIRD-PARTY-NOTICES.md (none)
• The PR does one thing (unrelated changes go in a separate PR)

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