feat(reader): add current chapter search

[aiko-chan-ai]

Overview:

• Added a "Find in Chapter" menu to search within the current chapter
• Search logic is equivalent to Chromium's implementation (patched react-native-webview@13.16.1)
• Better performance compared to implementing search using JavaScript
• Does not affect the DOM tree compared to JavaScript-based search implementations
• Can it be considered better than upstream PR 1877?

Known issues:

• Result navigation does not work in paginated reading mode
• The reader UI is rendered incorrectly when searching (with the virtual keyboard open)

Co-authored-by: OpenAI Codex codex@openai.com

[Copilot]

Pull request overview

Adds a native “Find in Chapter” search experience to the reader by wiring a search UI into ReaderScreen/ReaderAppbar, and enabling native WebView find APIs via a pnpm patch to react-native-webview@13.16.1 (Chromium-like behavior and avoiding JS/DOM-based search).

Changes:

• Introduce useNativeChapterSearch + ReaderSearchbar and integrate them into the reader header/footer flow.
• Extend WebViewReader messaging to surface native find results back to React Native.
• Add a pnpm patch for react-native-webview@13.16.1 to expose Android-native find commands and emit find-result events.

Reviewed changes

Copilot reviewed 10 out of 11 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
strings/types/index.ts	Adds the new readerScreen.findInChapter string key to the type map.
strings/languages/en/strings.json	Adds English translation for the search placeholder/menu item.
strings/languages/vi_VN/strings.json	Adds Vietnamese translation for the search placeholder/menu item.
src/screens/reader/ReaderScreen.tsx	Integrates native chapter search state, back handling, and WebView find result plumbing.
src/screens/reader/hooks/useNativeChapterSearch.ts	New hook that manages search visibility/query/results and calls native WebView find APIs.
src/screens/reader/components/WebViewReader.tsx	Adds onFindResult prop and handles find-result messages.
src/screens/reader/components/ReaderSearchbar.tsx	New UI component for in-chapter search input and result navigation controls.
src/screens/reader/components/ReaderAppbar.tsx	Adds menu entry to open search and swaps appbar content to ReaderSearchbar when active.
pnpm-workspace.yaml	Registers react-native-webview@13.16.1 as a patched dependency.
pnpm-lock.yaml	Records the patch hash + patched dependency resolution details.
patches/react-native-webview@13.16.1.patch	Implements Android-native WebView find commands + TS typings and emits find-result messages.

Files not reviewed (1)

• pnpm-lock.yaml: Generated file

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