Registers fp_tablet_pin_setup as an ir.actions.client tag. Triggered
from res.users preferences via action_open_tablet_pin_setup (added
to res_users.py in P6.1.1). Three-stage flow:
loading → check if user has existing PIN via search_count
old → enter current PIN (skipped if first-time)
new → choose new PIN
confirm → enter new PIN again
done → success toast + auto-close 1.5s later
Each stage reuses FpPinPad with a different onSubmit + title. On
mismatch / server error, resets to the first stage with a notification.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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