Session 37: Design system Phase F — mobile parity: 5-tab bar, More sheet, PWA polish (1872 tests)

VYNDR 2.0 conversion, Phase F (mobile is the PWA we launch first). Frontend-only;
zero backend changes.

- BottomTabBar rewritten to the §6 5-tab spec: Slate/Terminal/Scan/Ledger/More,
  with Scan as the prominent raised grade-green action. Shown for anon too (only
  mobile nav). Integrated More bottom sheet (sheet-up, backdrop dismiss, 48px mono
  rows). iOS safe-area + 44px touch targets.
- Nav hamburger retired on mobile (tab bar owns nav).
- globals.css mobile section: tab-bar hidden >=768, main bottom padding,
  grade-hero 80px, terminal-grid stacks, game-lines horizontal scroll.
- PWA: manifest shortcuts (Slate/Scan/Terminal) + categories; viewport-fit=cover.

Gotcha: `as const` on the TABS array broke type-check (distinct literal types);
fixed with a shared TabDef interface.

19 new tests. Backend 1853 -> 1872, 145 suites, zero regressions. Web build clean.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

CLAUDE.md

@@ -236,6 +236,24 @@ The frame every page sits in. Frontend-only.
 - **Reskinned** (logic preserved): `login` (scanlines + "ACCESS THE SIGNAL"),
   `pricing` (+ ClaimMeter). `account` redirects to `/profile`.
 
+## VYNDR 2.0 Mobile Parity (Session 37 — Phase F)
+- **Bottom tab bar** = `components/BottomTabBar.tsx`: 5 tabs (Slate/Terminal/
+  Scan/Ledger/More), Scan is the prominent raised grade-green action, More opens
+  an integrated bottom sheet. Shown for ALL users (anon included — it's the only
+  mobile nav); hidden on auth flows + landing via `HIDE_ON`, and hidden ≥768px
+  via the `.mobile-tab-bar` rule in globals.css. The Nav hamburger is retired on
+  mobile (the tab bar owns nav); the Nav's mobile panel is now dead code.
+- **Mobile CSS** lives in the "MOBILE PARITY" section of globals.css: `main`
+  bottom-padding clears the 64px bar + safe-area <768px; `.grade-hero` (the
+  GradeResultCard letter) → 80px <640px; `.terminal-grid` stacks <768px;
+  `.game-lines-grid` horizontal-scroll. Class hooks: `grade-hero`, `terminal-grid`.
+- **PWA**: manifest has shortcuts (Slate/Scan/Terminal) + categories
+  [sports,finance,productivity]; layout viewport sets `viewportFit: 'cover'`.
+- BUILD GOTCHA: don't use `as const` on heterogeneous config arrays (TABS) — it
+  makes each entry a distinct literal type and optional props fail type-check.
+  Use a shared interface. And the build worker exits code 1 on type errors —
+  check the build EXIT CODE, not just a `| tail` of its output.
+
 ## Active Skills
 - vyndr-voice (all user-facing output)
 - prop-analysis (grading methodology)