4 new state-machine modes on FpTabletLock, reusing the existing
FpPinPad 4-cell component:
- request_code : 'Send temp PIN' button screen (no-PIN tile OR
after 3-fail Forgot button)
- enter_temp_code : 4-cell pad for the emailed code
- set_new_pin : 4-cell pad — choose new PIN
- confirm_new_pin : 4-cell pad — confirm new PIN
Trigger paths (per D1 + D2):
- Tap no-PIN tile -> goes straight to request_code mode
(onTileClick dispatches via tile.has_pin)
- Wrong PIN 3 times -> 'Forgot? Reset PIN via email' button appears
below the pad (gated by state.failedAttempts >= 3)
Client-side failedAttempts counter (resets on tile re-select per D14).
Server-side x_fc_tablet_pin_failed_count keeps incrementing to the
existing 5-fail lockout per D13.
After Confirm New PIN succeeds, auto-login fires unlock_session with
the new PIN. If unlock_session fails for any reason, falls back to
'PIN set, tap your tile to log in.' status.
SCSS reuses $lock-* tokens from _tablet_lock_tokens.scss — light +
dark handled by the existing token system (no new tokens needed).
Hand-Off gold gradient repeated for the primary 'Send temporary PIN'
button to match the existing tablet visual language.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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