feat: edit in the Changes panel, git graph history, plan quota (v2.3.0)

- Changes panel: a working file opens in a CodeMirror editor with its diff
  inline (DiffEditor.tsx, @codemirror/merge, lazy-loaded); Changes folds the
  unchanged lines, Whole file shows them; side by side at 50/50 and full
  width; a Revert per block; original from HEAD or the branch's merge base
  (`mergeBase` on GET /git/changes?range=branch)
- Every diff: green = line added whole, red = removed whole, blue = edited
  in place (--diff-mod)
- History drawn as a commit graph (#58: `parents` on GET /git/log,
  --date-order; lib/commitGraph.ts)
- Per-workspace never-stage list, drawn orange in the Files tree (--kept);
  closed Terminal rows past three deleted
- Status bar plan quota for Claude (per account) and Codex
  (GET /api/pricing/quota, server/lib/quota.js); compact hover panel that
  stays open, Refresh button with a spinner
- Settings → Appearance holds language, theme and pet; Ctrl+Shift+C copies;
  compact sidebar navigation and short session times

client/src/i18n/locales/en/common.json

@@ -68,7 +68,11 @@
     "justNow": "just now",
     "mAgo": "{{count}}m ago",
     "hAgo": "{{count}}h ago",
-    "dAgo": "{{count}}d ago"
+    "dAgo": "{{count}}d ago",
+    "justNowShort": "now",
+    "mAgoShort": "{{count}}m",
+    "hAgoShort": "{{count}}h",
+    "dAgoShort": "{{count}}d"
   },
   "pagination": {
     "previous": "Previous",

client/src/i18n/locales/en/lanes.json

@@ -60,6 +60,9 @@
   "changes.commitPlaceholder": "Commit message",
   "changes.commitStaged": "Commit {{count}} staged",
   "changes.suggestMessage": "Suggest a commit message with AI (Claude, staged changes)",
+  "changes.neverStage": "Never stage — Stage all skips this file",
+  "changes.allowStage": "Include in Stage all again",
+  "changes.keptHint": "Never staged by Stage all (this browser)",
   "changes.conflicted": "conflict",
   "changes.discard": "Discard this file's changes",
   "changes.discardConfirm": "Click again to discard — this cannot be undone",
@@ -113,6 +116,7 @@
   "changes.truncated": "Some changes were left out to keep this panel responsive.",
   "changes.unavailable": "This workspace's directory is not a readable git repository.",
   "changes.unstage": "Unstage this file",
+  "changes.changesView": "Changes",
   "changes.wholeFile": "Whole file",
   "confirmRemoveCancel": "Cancel",
   "confirmRemoveConfirm": "Remove",
@@ -239,8 +243,8 @@
   "changes.undoHunkShortConfirm": "Confirm undo",
   "changes.edit": "Edit",
   "changes.save": "Save",
+  "changes.revertBlock": "Revert",
   "changes.cancelEdit": "Cancel",
-  "changes.clickToEdit": "Click the text to edit",
   "changes.preview": "Preview",
   "changes.raw": "Raw",
   "changes.editorLabel": "Edit {{path}}",

client/src/i18n/locales/en/nav.json

@@ -67,7 +67,20 @@
     "today": "Today {{cost}}",
     "workspace": "Workspace {{cost}}",
     "session": "Session {{cost}}",
-    "tokens": "({{tokens}} Tokens)"
+    "tokens": "({{tokens}} Tokens)",
+    "quotaUsed": "{{pct}}% used",
+    "quotaTitle": "Usage",
+    "quotaResets": "Resets in {{time}}",
+    "quotaAsOf": "as of {{ago}}",
+    "quotaRefresh": "Refresh",
+    "quotaRefreshing": "Refreshing…",
+    "quotaExpired": "Token expired: use Claude Code once so it refreshes",
+    "quotaFailed": "Could not read the quota",
+    "quotaActive": "in use",
+    "quotaProfileExpired": "Sign-in expired: use Check quota in Claude Code → Profiles to refresh it",
+    "quotaSignInExpires": "Sign-in expires in {{time}}",
+    "quotaSignInExpired": "Sign-in expired",
+    "quotaWindow": { "wk": "Week", "mo": "Month" }
   },
   "version": "Version",
   "openMenu": "Open menu",

client/src/i18n/locales/en/settings.json

@@ -21,7 +21,7 @@
       "import": "Import .codex-pet bundle…",
       "browse": "Find more on codex-pets.net",
       "settings": "Pet settings…",
-      "hiddenToast": "Pet hidden. Show it again in Settings → Pet.",
+      "hiddenToast": "Pet hidden. Show it again in Settings → Appearance.",
       "deleteTitle": "Delete {{name}}?",
       "deleteMessage": "The pet's files are removed from this install. A featured pet can be downloaded again; an upload is gone for good.",
       "deleteConfirm": "Delete pet",
@@ -653,7 +653,10 @@
     "reset": "Reset to defaults",
     "resetTitle": "Reset appearance?",
     "resetBody": "Mode goes back to Dark and both modes to their default theme.",
-    "resetDone": "Appearance reset."
+    "resetDone": "Appearance reset.",
+    "theme": "Theme",
+    "pet": "Pet",
+    "petDescription": "The corner mascot: show it, its size, speech bubbles, and which pet it wears."
   },
   "gitCreds": {
     "title": "Git credentials",
@@ -753,17 +756,9 @@
       "cost": "Cost"
     },
     "section": {
-      "general": {
-        "title": "General",
-        "description": "The dashboard's display language."
-      },
       "appearance": {
         "title": "Appearance",
-        "description": "Colour mode and theme. Saved in this browser only."
-      },
-      "pet": {
-        "title": "Pet",
-        "description": "The corner mascot: show it, its size, speech bubbles, and which pet it wears."
+        "description": "Language, colour mode and theme, and the corner pet."
       },
       "notifications": {
         "title": "Notifications",