M1: phone app shell, settings, profile, dev login

Everything now renders inside a phone illustration on the entry screen,
with a five-tab bar. The frame lives in the root layout rather than one
page, so sign-in, onboarding and the job form are inside it too.

- Entry screen is the product running, not a marketing page: a live
  swipeable deck of real verified pros with a trade-filter strip above
  the card. deck.showcase is the only public procedure in that router
  and writes nothing, so an anonymous right swipe reaches no one.

- Settings: notification preferences (new table, defaults returned when
  no row exists), signed-in devices, GDPR export, deletion request.

  Closes the setEmail finding: an unverified address is no longer
  written to users.email, which is UNIQUE -- claiming a stranger's
  address used to block them from ever signing up with Google, and the
  uniqueness error leaked whether an address was registered. Now parked
  in email_change_requests until a token proves ownership.

- Profile: for a pro it leads with their REAL deck card, rendered by the
  same exported <Card> clients swipe, so the two cannot drift. Adds
  pro.previewCard (works at draft/pending, where publicProfile 404s) and
  pro.reorderMedia (photo position 0 is the deck card). Warns before an
  edit that would send a verified pro back for review, rather than after
  it silently drops them off the deck. Clients get a thin profile plus a
  route into pro onboarding -- supply is the launch blocker.

- Dev login: +34600000000 / 000000, behind THREE guards (NODE_ENV,
  an explicit ALLOW_DEV_LOGIN flag, and an exact number match). It
  overwrites the stored code rather than skipping verification, so the
  real expiry, attempt cap and single-use consumption still apply.

- Seed uses portrait photos. The cards previously showed picsum stock
  scenery -- a locksmith standing on a railway track.

Fixes found along the way: the card's name rendered ink-950 navy on a
dark photo because globals.css sets h1..h6 colour in @layer base, which
beat the inherited text-white; and the card referenced --color-go-500,
--border and --card, none of which exist, so the SEND JOB stamp had no
colour.

Also adds public/sw.js as a kill-switch: a service worker left
registered on localhost:3000 by a different project was intercepting
this app's chunks.

typecheck, lint clean; 186 tests pass.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

.env.example

@@ -12,6 +12,9 @@ REDIS_URL=redis://localhost:6389
 # generate with: openssl rand -base64 32
 AUTH_SECRET=
 AUTH_URL=http://localhost:3000
+# Optional. Leave blank and phone OTP is the only route: the "Continue with
+# Google" button still renders, and tells the user it is not set up.
+# Authorised redirect URI: {NEXT_PUBLIC_APP_URL}/api/auth/callback/google
 AUTH_GOOGLE_ID=
 AUTH_GOOGLE_SECRET=
 
@@ -48,3 +51,6 @@ NEXT_PUBLIC_CITY_NAME=Barcelona
 NEXT_PUBLIC_CITY_LAT=41.3874
 NEXT_PUBLIC_CITY_LNG=2.1686
 TWILIO_FROM_NUMBER=
+
+# Dev-only fixed login (+34600000000 / code 000000). MUST stay false/unset in production.
+ALLOW_DEV_LOGIN=false