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/lib/api/types.ts

@@ -236,6 +236,37 @@ export interface GitMergeResult {
   conflictFiles?: string[];
 }
 
+export interface CheckoutCommitResponse {
+  success: boolean;
+}
+
+export interface CherryPickRequest {
+  hash: string;
+}
+export interface CherryPickResponse {
+  success: boolean;
+  conflict?: boolean;
+  conflictFiles?: string[];
+}
+
+export interface RevertCommitRequest {
+  hash: string;
+}
+export interface RevertCommitResponse {
+  success: boolean;
+  conflict?: boolean;
+  conflictFiles?: string[];
+}
+
+export interface ResetToCommitRequest {
+  hash: string;
+  mode: 'soft' | 'mixed' | 'hard';
+  force?: boolean;
+}
+export interface ResetToCommitResponse {
+  success: boolean;
+}
+
 export interface GitRebaseResult {
   success: boolean;
   conflict?: boolean;
@@ -291,6 +322,7 @@ export interface GitLogEntry {
   filesChanged: number;
   insertions: number;
   deletions: number;
+  parents: string[];
 }
 
 export interface GitLogResponse {
@@ -404,6 +436,7 @@ export interface GitLogOptions {
   from?: string;
   to?: string;
   file?: string;
+  all?: boolean;
 }
 
 export interface GeneratedCommitMessage {
@@ -484,6 +517,10 @@ export interface GitAPI {
   merge(directory: string, options: { branch: string }): Promise<GitMergeResult>;
   abortMerge(directory: string): Promise<{ success: boolean }>;
   continueMerge(directory: string): Promise<{ success: boolean; conflict: boolean; conflictFiles?: string[] }>;
+  checkoutCommit(directory: string, hash: string): Promise<CheckoutCommitResponse>;
+  cherryPick(directory: string, hash: string): Promise<CherryPickResponse>;
+  revertCommit(directory: string, hash: string): Promise<RevertCommitResponse>;
+  resetToCommit(directory: string, hash: string, mode: 'soft' | 'mixed' | 'hard', force?: boolean): Promise<ResetToCommitResponse>;
   stash(directory: string, options?: { message?: string; includeUntracked?: boolean }): Promise<{ success: boolean }>;
   stashPop(directory: string): Promise<{ success: boolean }>;
   getConflictDetails(directory: string): Promise<MergeConflictDetails>;