feat(defaults): Compact header, Tiles button on, Classic tab layout

The owner's picks after testing the 1.36.0 beta:

- Header Stats Style defaults to Compact (two pills with rings) instead of
  Tiles. The resolver, the pre-paint stamp and the App Settings option all
  agree; an unknown value now reads as compact.
- The Tiles header button is ON by default everywhere but handhelds (their
  defaults object keeps it off, and the button still needs a 1180px window).
  The Ctrl+Shift+G gate in tileShortcutFor() now resolves an absent key
  through the device defaults too, so the chord and the button cannot
  disagree; before, it required a stored true.
- Tab Layout defaults to Classic (the single strip, as before). By state, By
  case and Ledger stay available as opt-ins. The tile-grid beta the owner used
  last had only this layout, and it is the one they wanted back.

zh-CN option labels follow the new "(default)" markers; docs and wiki updated.

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

src/web/public/styles.css

@@ -20653,7 +20653,7 @@ html .toolbar .btn-git-status[aria-expanded='true'] {
 }
 
 /* ============================================================
-   Tab grouping by state (tabArrangement: 'state', the default;
+   Tab grouping by state (tabArrangement: 'state', opt-in;
    Discussion #426 option C)
    ============================================================
    app.js writes a flex `order` per tab plus one heading and one row break per