Fix bookmark typeahead not rendering suggestions

[G-Gamja]

Summary

• fetchBookmarkSuggestions was a plain class method passed by reference to
  BlockHeaderSuggestionControl (fetchSuggestions={model.fetchBookmarkSuggestions}).
  Calling it as a bare function lost its this binding, so this.env threw a
  TypeError inside the method. The rejection had no .catch, so fetched
  never flipped to true and neither the bookmark list nor the empty state
  ever rendered — pressing Cmd+O just showed an empty input with nothing
  below it.
• The "Open bookmarks.json" button in the empty state pointed at
  presets/bookmarks.json, a path nothing else reads from or writes to.
  Bookmarks are actually loaded from <configDir>/bookmarks.json. Clicking
  the button created a dead file that had no effect on the app.

Fix

• Converted fetchBookmarkSuggestions to an arrow function class field so
  this stays bound to the WebViewModel instance regardless of how it's
  invoked.
• Fixed the "Open bookmarks.json" button to point at <configDir>/bookmarks.json.

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[coderabbitai]

Walkthrough

This change modifies frontend/app/view/webview/webview.tsx in two ways: it converts the WebViewModel's fetchBookmarkSuggestions from an async class method into an async arrow-function class field to ensure proper this-binding when used as a callback, and it updates the bookmarks JSON file path in openBookmarksJson from configDir/presets/bookmarks.json to configDir/bookmarks.json.

Estimated code review effort: 1 (Trivial) | ~3 minutes

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Title check	✅ Passed	The title clearly summarizes the main change: fixing bookmark typeahead suggestion rendering.
Description check	✅ Passed	The description accurately describes the code changes and the bug they address.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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