feat: ファイル変更差分表示の追加#22
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- Add getSessionDiff() method to OpenCodeClient - Add getSessionDiff/openDiffEditor message handlers in ChatViewProvider - Register opencode-diff-before/after TextDocumentContentProviders - Export FileDiff type from opencode-client
- Add sessionDiff, getSessionDiff, openDiffEditor message types - Add fileChanges.* locale strings (en/ja) - Add DiffIcon and ExternalLinkIcon components
- Handle session.diff SSE events - Provide diffs/setDiffs/clearDiffs/handleFileChangeEvent
- TodoHeader-style collapsible bar with file count and stats - Per-file items with status badge (A/D/M), inline diff, open button - Expandable inline DiffView for each file
- Wire useFileChanges hook and sessionDiff message handling in App - Add fileDiffs/onOpenDiffEditor to AppContext - Render FileChangesHeader below TodoHeader above InputArea
- Add DiffIcon/ExternalLinkIcon to icons unit tests (+16 tests) - Add FileChangesHeader unit tests (22 tests) - Add useFileChanges hook tests (5 tests) - Add scenario test 15-file-changes (12 tests)
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Summary
セッションレベルのファイル変更差分を表示する機能を追加。SDK の
session.diff()API を利用し、TodoHeader と同様の折りたたみバー UI で変更ファイル一覧・インライン差分・VS Code ネイティブ diff エディタへの連携を提供する。Related Issue
Closes #16
Changes
バックエンド（Extension Host）
opencode-client.ts:getSessionDiff()メソッド追加、FileDiff型のエクスポートchat-view-provider.ts:getSessionDiff/openDiffEditorメッセージハンドラ追加extension.ts:opencode-diff-before/opencode-diff-afterTextDocumentContentProvider 登録メッセージ型・共通
vscode-api.ts:sessionDiff（Ext→Webview）、getSessionDiff/openDiffEditor（Webview→Ext）メッセージ型追加locales/en.ts,locales/ja.ts:fileChanges.*ロケール文字列追加icons.tsx:DiffIcon,ExternalLinkIcon追加Webview
useFileChangesフック:session.diffSSE イベントで差分データを管理FileChangesHeaderコンポーネント: TodoHeader 風の折りたたみバー UIApp.tsx: フック統合、sessionDiffメッセージ処理、TodoHeader の下に FileChangesHeader を配置AppContext.tsx:fileDiffs/onOpenDiffEditor追加テスト
icons.test.tsx: DiffIcon / ExternalLinkIcon 単体テスト（+16）FileChangesHeader.test.tsx: コンポーネント単体テスト（22）useFileChanges.test.ts: フック単体テスト（5）15-file-changes.test.tsx: シナリオテスト（12）Checklist
npm run buildpassesnpm testpasses (52 files, 709 tests)