feat(git-graph): VS Code-style git graph with commit actions in History modal (#1431)

* feat(types): add parents to GitLogEntry and new commit action types

* feat(git): add parent hashes and --all flag to getLog

* fix(git): move record separator to start of log format string

* feat(git): add checkoutCommit server function and route

* feat(git): add cherryPick server function and route

* feat(git): add revertCommit server function and route

* feat(git): add resetToCommit server function and route

* fix(tests): make git service tests branch-name portable, add error path tests

* feat(client): add checkoutCommit, cherryPick, revertCommit, resetToCommit API wrappers

* feat(git-graph): add lane assignment algorithm with tests

* feat(git-graph): add GitGraphSegment per-row SVG renderer

* feat(i18n): add locale strings for git graph action buttons

* fix(git-graph): handle lane convergence, fix SVG path coords, add connector tests

* feat(git-graph): add ref badges and action buttons to HistoryCommitRow

* fix(git-graph): add loading guards to reset actions, use theme tokens for ref badges

* fix(git-graph): conditional hooks, stale graph log, conflict handling, i18n

* fix(types): replace toBeDefined with toBeTruthy, fix toast API usage

* fix(lint): remove unused variables

* fix(git-graph): fix SVG height causing 150px row spacing

* fix(git-graph): smooth bezier curves, fill row height, round line caps

* fix(git-graph): non-scaling-stroke fixes bezier white spaces, sort curves on top

* fix(git-graph): remove viewBox scaling, match SVG height to actual row height

* fix(git-graph): ResizeObserver tracks actual row height, eliminates SVG height mismatch

* feat(git-graph): replace SVG with Canvas for graph rendering

* fix(git-graph): isolate canvas from flex layout to prevent replaced-element height leak

* feat(git-graph): align action buttons, add confirmation popups for all actions

* fix(git-graph): address code review findings CR-001 through CR-005

- CR-001: VS Code getGitLog now forwards 'all' option and parses %P parents
- CR-002: VS Code bridge/gitService implement checkoutCommit, cherryPick,
  revertCommit, resetToCommit with conflict detection and hard-reset guard
- CR-003: server-side commit hash validated with /^[0-9a-fA-F]{7,40}$/
  in both routes.js and service.js; 12 new rejection tests added
- CR-004: cherry-pick/revert conflict path now refreshes fetchStatus/
  fetchBranches/fetchLog; conflict toast uses i18n keys in all 7 locales
- CR-005: corrected O(n) comment to O(n x lanes)

* fix(i18n): add zh-TW locale and common.language.traditionalChinese key to all locales

upstream/main added zh-TW.ts after branch diverged; CI type-check fails
when PR is merged because zh-TW.ts was missing all gitView.history.actions.*
keys and loadMore/loadingMore. Also adds common.language.traditionalChinese
to en.ts and all 6 non-English files to match upstream en.ts.

* fix: harden git history actions

* feat: split git history graph view

* chore: remove git graph planning docs

---------

Co-authored-by: Bohdan Triapitsyn <artmore@protonmail.com>

packages/vscode/src/bridge-git-runtime.ts

@@ -14,6 +14,10 @@ const requireDirectory = (id: string, type: string, directory?: string): BridgeR
   return null;
 };
 
+const isValidCommitHash = (hash: string | undefined): hash is string => (
+  typeof hash === 'string' && /^[0-9a-fA-F]{7,40}$/.test(hash)
+);
+
 export async function handleStandardGitBridgeMessage(message: BridgeMessageInput): Promise<BridgeResponse | null> {
   const { id, type, payload } = message;
 
@@ -416,17 +420,70 @@ export async function handleStandardGitBridgeMessage(message: BridgeMessageInput
       return { id, type, success: true, data: result };
     }
 
+    case 'api:git/checkout-commit': {
+      const { directory, hash } = (payload || {}) as { directory?: string; hash?: string };
+      const dirError = requireDirectory(id, type, directory);
+      if (dirError) return dirError;
+      if (!isValidCommitHash(hash)) {
+        return { id, type, success: false, error: 'Invalid commit hash' };
+      }
+      const result = await gitService.checkoutCommit(directory!, hash);
+      return { id, type, success: true, data: result };
+    }
+
+    case 'api:git/cherry-pick': {
+      const { directory, hash } = (payload || {}) as { directory?: string; hash?: string };
+      const dirError = requireDirectory(id, type, directory);
+      if (dirError) return dirError;
+      if (!isValidCommitHash(hash)) {
+        return { id, type, success: false, error: 'Invalid commit hash' };
+      }
+      const result = await gitService.cherryPick(directory!, hash);
+      return { id, type, success: true, data: result };
+    }
+
+    case 'api:git/revert-commit': {
+      const { directory, hash } = (payload || {}) as { directory?: string; hash?: string };
+      const dirError = requireDirectory(id, type, directory);
+      if (dirError) return dirError;
+      if (!isValidCommitHash(hash)) {
+        return { id, type, success: false, error: 'Invalid commit hash' };
+      }
+      const result = await gitService.revertCommit(directory!, hash);
+      return { id, type, success: true, data: result };
+    }
+
+    case 'api:git/reset-to-commit': {
+      const { directory, hash, mode, force } = (payload || {}) as {
+        directory?: string;
+        hash?: string;
+        mode?: 'soft' | 'mixed' | 'hard';
+        force?: boolean;
+      };
+      const dirError = requireDirectory(id, type, directory);
+      if (dirError) return dirError;
+      if (!isValidCommitHash(hash)) {
+        return { id, type, success: false, error: 'Invalid commit hash' };
+      }
+      if (!mode || !['soft', 'mixed', 'hard'].includes(mode)) {
+        return { id, type, success: false, error: 'mode must be soft, mixed, or hard' };
+      }
+      const result = await gitService.resetToCommit(directory!, hash, mode, force);
+      return { id, type, success: true, data: result };
+    }
+
     case 'api:git/log': {
-      const { directory, maxCount, from, to, file } = (payload || {}) as {
+      const { directory, maxCount, from, to, file, all } = (payload || {}) as {
         directory?: string;
         maxCount?: number;
         from?: string;
         to?: string;
         file?: string;
+        all?: boolean;
       };
       const dirError = requireDirectory(id, type, directory);
       if (dirError) return dirError;
-      const result = await gitService.getGitLog(directory!, { maxCount, from, to, file });
+      const result = await gitService.getGitLog(directory!, { maxCount, from, to, file, all });
       return { id, type, success: true, data: result };
     }