fix: v2.7.4 — Changes matches JetBrains (#72), the chat says when Claude waits on a trust prompt (#73), Vietnamese Telex in Safari

- Changes (#72): a file git reports `MM` whose working copy equals HEAD again
  (a staged change since undone on disk) is no longer listed — JetBrains'
  GitChangesCollector drops it the same way. Mode-only changes stay listed.
  statusCounts (the dirty-tree safety checks) is unchanged.
- Chat (#73): Claude Code runs no hook before a folder is trusted, so a new
  pane's session has no row; the chat now says the session has not started,
  offers Open terminal, and asks before typing a message or /model //effort
  into the pane (an Enter would pick the trust prompt's "No, exit").
- Terminal: Safari + macOS's own Vietnamese Telex replaces the whole word on
  each key (insertReplacementText), which xterm.js ignores — only each word's
  first letter reached the pane. The edit is now sent as DELs + the new tail.
- Also: Ctrl+V pastes a screenshot into the terminal as a file path; the
  folder browser fallback lists files for a file field (`files=1`); the macOS
  native picker opens in front of the browser; a hidden tab is marked while a
  chat waits or once a turn ended; chat live line shows running calls, turn
  time and tokens, and "Done in …".

client/src/index.css

@@ -534,6 +534,31 @@
   animation: pulse-dot 2s cubic-bezier(0.4, 0, 0.6, 1) infinite;
 }
 
+/* The chat's live step, like Claude Code's: a light sweeping over the words.
+   Reduced motion stops it on the muted colour. */
+.text-shimmer {
+  background: linear-gradient(
+      90deg,
+      rgb(var(--fg-muted)) 40%,
+      rgb(var(--fg-primary)) 50%,
+      rgb(var(--fg-muted)) 60%
+    )
+    0 0 / 300% 100%;
+  -webkit-background-clip: text;
+  background-clip: text;
+  color: transparent;
+  animation: text-shimmer 2.5s linear infinite;
+}
+
+@keyframes text-shimmer {
+  from {
+    background-position: 100% 0;
+  }
+  to {
+    background-position: 0 0;
+  }
+}
+
 /* Rendered markdown (MarkdownPreview.tsx): theme tokens only, so every theme
    reads it; no typography plugin. */
 .md-preview {