Fix drift sync: per-window verdicts, forgiving class match, event-driven status bar

Three independent defects made the focus state feel flaky and let the OS
status bar disagree with the web UI:

- Status file lagged the web by up to a minute: it rendered only on a 60s
  ticker with no hook into state changes. notify() now fans out to multiple
  listeners (AddOnChange) and the writer has a coalesced Wake() so drift
  reaches the bar as promptly as the browser.

- A brief off-task visit could latch drift for the whole session. Sibling
  windows of one app (a browser's reading tab vs its chat tab) share a window
  class, but the judge verdict was cached by class alone, so one tab's verdict
  poisoned the rest and never re-judged. Cache is now keyed by class + scrubbed
  title (judgedWindows) so siblings are judged independently.

- Allowed-class matching was exact equality, so a short token ("brave") never
  matched the real WM_CLASS ("Brave-browser") and every window was routed to
  the LLM. Matching is now substring-based, and planning surfaces the live
  window class with a click-to-add chip so users pick a token that matches.

Also fix the planning checkbox alignment: the global full-width input rule was
stretching the "Enforce focus" checkbox; scope it out for checkboxes.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

internal/web/static/app.css

@@ -73,6 +73,12 @@ input {
   border-radius: 8px; color: var(--ink); font: inherit;
 }
 input:focus { outline: 0; border-color: var(--accent); }
+/* Checkboxes must opt out of the full-width text-input styling above, which
+   otherwise stretches the box across the row and shoves its label adrift. */
+input[type="checkbox"] {
+  width: auto; flex: none; margin: 0; padding: 0; accent-color: var(--accent);
+}
+.enforce-toggle { justify-content: flex-start; }
 
 .btn {
   margin-top: 16px; padding: 10px 16px; border: 0; border-radius: 8px;