feat(rate-limits): Grok CLI OAuth weekly credit usage (#7869)

* feat(rate-limits): Grok CLI OAuth weekly credit usage in status bar

Read ~/.grok/auth.json (read-only), fetch billing credits via cli-chat-proxy, and surface Grok in Settings, status bar toggles, and rate-limit polling alongside other usage providers.

* fix(grok): clarify comments and address CodeRabbit review

- Shorten Why comments per AGENTS.md; fix billing period end fallback.

- Share GrokAccountStatus type; hash-based locale keys; reload why in Settings.

* docs(grok): plain-language comments and Settings copy

* feat(stats): subscription usage section with Grok in Stats & Usage

Surface rate-limit weekly credits in Settings > Stats & Usage and link to Accounts for setup.

* feat(stats): Grok tab in Usage Analytics dropdown

* refactor(stats): drop Subscription usage block; align Grok pane with Codex

* fix(grok): align settings copy and visibility tests

* fix(grok): add localization catalog entries

* fix(grok): avoid eager usage refresh fanout

* fix(grok): harden usage refresh visibility

* test(grok): cover account status privacy boundary

* fix(grok): target refreshes and redact auth errors

* fix(grok): hide usage UI for signed-out users and align empty states

- Treat a token-less auth.json (e.g. after grok logout) as signed out
  instead of surfacing a permanent status-bar error.
- Map billing responses without credit usage to 'unavailable' so plans
  with no weekly credits hide the bar like Claude API-key billing.
- Gate the grok status-bar item and toggle on CLI PATH detection,
  matching claude/codex/gemini/kimi.
- Guard an empty GROK_CLI_CHAT_PROXY_BASE_URL from producing a
  relative billing URL.
- Drop dead minimax/kimi Stats & Usage search keywords left from the
  removed subscription section.
- Add missing grok search keyword catalog entries and translate the
  English-stubbed stats keywords in es/ja/ko/zh.

* test(ipc): mock grok account registrar in register-core-handlers test

---------

Co-authored-by: Brennan Benson <brennanbenson@Brennans-MacBook-Pro.local>

src/main/runtime/rpc/methods/client-ui.test.ts

@@ -182,10 +182,11 @@ describe('client UI RPC methods', () => {
       ...getDefaultUIState(),
       worktreeCardProperties: ['status', 'branch', 'automation', 'inline-agents'],
       _worktreeCardModeDefaulted: true,
-      statusBarItems: ['codex', 'kimi', 'minimax', 'ports'],
+      statusBarItems: ['codex', 'kimi', 'minimax', 'grok', 'ports'],
       _portsStatusBarDefaultAdded: true,
       _kimiStatusBarDefaultAdded: true,
       _minimaxStatusBarDefaultAdded: true,
+      _grokStatusBarDefaultAdded: true,
       taskResumeState: {
         githubMode: 'items',
         githubItemsQuery: 'is:open',
@@ -221,10 +222,11 @@ describe('client UI RPC methods', () => {
     const payload = {
       worktreeCardProperties: ['status', 'branch', 'automation', 'inline-agents'],
       _worktreeCardModeDefaulted: true,
-      statusBarItems: ['codex', 'kimi', 'minimax', 'ports'],
+      statusBarItems: ['codex', 'kimi', 'minimax', 'grok', 'ports'],
       _portsStatusBarDefaultAdded: true,
       _kimiStatusBarDefaultAdded: true,
       _minimaxStatusBarDefaultAdded: true,
+      _grokStatusBarDefaultAdded: true,
       taskResumeState: {
         githubMode: 'items',
         githubItemsQuery: 'is:open',

src/main/runtime/rpc/methods/client-ui.ts

@@ -47,6 +47,7 @@ const StatusBarItem = z.enum([
   'opencode-go',
   'kimi',
   'minimax',
+  'grok',
   'ssh',
   'resource-usage',
   'ports'
@@ -203,6 +204,7 @@ const UiUpdate = z
     _portsStatusBarDefaultAdded: z.boolean().optional(),
     _kimiStatusBarDefaultAdded: z.boolean().optional(),
     _minimaxStatusBarDefaultAdded: z.boolean().optional(),
+    _grokStatusBarDefaultAdded: z.boolean().optional(),
     statusBarVisible: z.boolean().optional(),
     dismissedUpdateVersion: NullableString.optional(),
     lastUpdateCheckAt: z.number().finite().nullable().optional(),