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/ui/src/components/views/git/GitHeader.tsx

@@ -43,6 +43,7 @@ interface GitHeaderProps {
   isApplyingIdentity: boolean;
   isWorktreeMode: boolean;
   onOpenHistory?: () => void;
+  onOpenGraph?: () => void;
   onOpenStashes?: () => void;
   actionTabItems?: SortableTabsStripItem[];
   activeActionTab?: string;
@@ -246,6 +247,7 @@ export const GitHeader: React.FC<GitHeaderProps> = ({
   isApplyingIdentity,
   isWorktreeMode,
   onOpenHistory,
+  onOpenGraph,
   onOpenStashes,
   actionTabItems,
   activeActionTab,
@@ -258,7 +260,7 @@ export const GitHeader: React.FC<GitHeaderProps> = ({
 
   const managementButtons = (
     <div className="flex items-center gap-1 shrink-0">
-      {onOpenHistory || onOpenStashes ? (
+      {onOpenHistory || onOpenGraph || onOpenStashes ? (
         <DropdownMenu>
           <Tooltip>
             <TooltipTrigger asChild>
@@ -267,13 +269,13 @@ export const GitHeader: React.FC<GitHeaderProps> = ({
                   variant="ghost"
                   size="sm"
                   className="h-8 w-8 px-0"
-                  aria-label={t('gitView.history.title')}
+                  aria-label={t('gitView.header.repositoryViews')}
                 >
                   <Icon name="git-repository" className="size-4" />
                 </Button>
               </DropdownMenuTrigger>
             </TooltipTrigger>
-            <TooltipContent sideOffset={8}>{t('gitView.history.title')}</TooltipContent>
+            <TooltipContent sideOffset={8}>{t('gitView.header.repositoryViews')}</TooltipContent>
           </Tooltip>
           <DropdownMenuContent align="end">
             {onOpenHistory ? (
@@ -282,6 +284,12 @@ export const GitHeader: React.FC<GitHeaderProps> = ({
                 {t('gitView.history.title')}
               </DropdownMenuItem>
             ) : null}
+            {onOpenGraph ? (
+              <DropdownMenuItem onSelect={onOpenGraph}>
+                <Icon name="git-merge" className="size-4" />
+                {t('gitView.graph.title')}
+              </DropdownMenuItem>
+            ) : null}
             {onOpenStashes ? (
               <DropdownMenuItem onSelect={onOpenStashes}>
                 <Icon name="archive-stack" className="size-4" />