* fix(workspace): keep focus mode scoped and easy to exit
Route focus mode through the active workspace so persisted state cannot hide chrome on settings or other screens. Add a visible exit control and keep desktop window chrome aligned and visually quiet.
* fix(app): clarify muted chrome semantics
Two breakages surfaced when CI started running desktop tests:
- Root vitest.config.ts replaced default exclude with `["**/.claude/**"]`,
losing `**/node_modules/**`. Desktop has no local vitest config, so
vitest scanned into `node_modules/zod/src/v4/classic/tests/*.test.ts`
and failed on missing peers (`@web-std/file`, `recheck`). Spread
`configDefaults.exclude` so node_modules stays excluded.
- window-manager dark titlebar color changed from #18181c to #181B1A in
963c7926 (white-flash fix) but the test was not updated. Update the
expected color to match the new intended behavior.
