Desk Rave v0.1.1

Remove Zen mode — one consistent Game view

Zen mode defaulted ON and hid the whole score/economy layer (fans, buffs,
fan feed, Cred chip) plus muted the break/curfew nudges. That made the game
read as "nothing is happening" out of the box. Retired it entirely: the
economy, nudges, and HUD are always on now, so what the player sees matches
what the systems are doing.

- profile: drop the `zen` setting (+ migrate it off stale saves)
- main/controls: collapse every zen() guard to the game path; delete the
  one-tap Game/Calm toggle button and the remote "mode" command
- css/html: remove the modeToggle element + all body.zen rules

Verified in-browser: toggle gone, no body.zen class, buffs/economy visible,
no "Zen mode" setting, zero console errors.

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