Terminal file viewer/editor + per-window app-command lockdown (#60)

Clicking a file path in Claude's terminal output now opens the file in its own window with a CodeMirror 6 editor. The editor highlights the target line, live-reloads while the file changes, and saves explicitly with hash-based conflict detection. The viewer commands are gated by window label.

Every app command is now ACL-gated per window through a Tauri AppManifest. build.rs checks the handler list against the capability files and fails the build on any mismatch.

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>

app/src/index.css

@@ -33,6 +33,15 @@
   /* Two radii only: controls and panels. */
   --radius-control: 6px;
   --radius-panel: 8px;
+  /* Syntax colours for the file viewer's editor (viewer/viewerTheme.ts). Same
+     GitHub-dark palette TerminalView.tsx already uses for ANSI, expressed as
+     tokens rather than hard-coded hex per the styling convention above. */
+  --syntax-keyword: #ff7b72;
+  --syntax-string: #a5d6ff;
+  --syntax-number: #79c0ff;
+  --syntax-function: #d2a8ff;
+  --syntax-type: #ffa657;
+  --syntax-property: #7ee787;
   color-scheme: dark;
 }