.planning/phases/17-ui-optimization-polish/17-03-SUMMARY.md

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+---
+phase: "17"
+plan: "03"
+subsystem: pwa/layout
+tags: [layout-fix, fab-overlap, bottom-tab-bar, phone-only, regression-guard, css-tokens, d-01, d-02]
+dependency_graph:
+  requires:
+    - apps/pwa/src/styles/tokens.css — --bottom-chrome-h token (provided by plan 17-01)
+  provides:
+    - FAB overlap fix: CalendarShell.tsx FAB bottom = calc(var(--bottom-chrome-h) + var(--space-6))
+    - Phone content padding: App.tsx contentStyle paddingBottom = var(--bottom-chrome-h) (phone-only)
+    - Regression guard: apps/pwa/e2e/layout.spec.ts — D-01 overlap assertion (iphone + pixel)
+  affects:
+    - apps/pwa/src/components/CalendarShell.tsx (FAB bottom offset)
+    - apps/pwa/src/App.tsx (contentStyle paddingBottom)
+    - apps/pwa/e2e/layout.spec.ts (new overlap assertion)
+tech_stack:
+  added: []
+  patterns:
+    - "CSS calc() combining --bottom-chrome-h token with --space-6 for FAB clearance above BottomTabBar"
+    - "Spread pattern ...(phone ? { paddingBottom: var(--bottom-chrome-h) } : {}) for phone-only contentStyle"
+    - "Playwright boundingBox() geometry assertion: fabBox.y + fabBox.height <= navBox.y"
+key_files:
+  created: []
+  modified:
+    - apps/pwa/src/components/CalendarShell.tsx
+    - apps/pwa/src/App.tsx
+    - apps/pwa/e2e/layout.spec.ts
+decisions:
+  - "FAB bottom uses calc(var(--bottom-chrome-h) + var(--space-6)) — positions FAB 24px above bar top edge regardless of safe-area-inset value"
+  - "contentStyle paddingBottom is phone-only via spread pattern — desktop has no BottomTabBar and must not gain extra bottom padding (RESEARCH Pitfall 2)"
+  - "Overlap assertion skips desktop profile — the desktop New Event button is a toolbar button, not the FAB; geometry check is semantically wrong for sidebar layout"
+  - "Full e2e suite run on all three profiles confirmed zero regressions from layout changes"
+metrics:
+  duration: "~18 minutes"
+  completed_date: "2026-06-18"
+  tasks_completed: 3
+  tasks_total: 3
+  files_changed: 3
+status: complete
+---
+
+# Phase 17 Plan 03: Phone Layout Overlap Fix — Summary
+
+Fixed the long-standing phone (≤767px) fixed-chrome overlap where the `position: fixed` BottomTabBar was covering the New Event FAB and occluding the bottom color-legend chips, using the `--bottom-chrome-h` token from plan 17-01. Added a permanent D-01 overlap regression assertion to `layout.spec.ts`. Full 3-profile Playwright suite is green.
+
+## What Was Built
+
+**One-liner:** FAB lifted above BottomTabBar via `calc(var(--bottom-chrome-h) + var(--space-6))`, phone content reserves `--bottom-chrome-h` padding, permanent overlap regression guard added to CI.
+
+### Task 1: FAB lift + phone content padding (CalendarShell.tsx, App.tsx)
+
+**CalendarShell.tsx** (phone-only FAB, lines 463–491):
+- Changed `bottom: 'var(--space-6)'` → `bottom: 'calc(var(--bottom-chrome-h) + var(--space-6))'`
+- FAB now sits 24px (var(--space-6)) above the BottomTabBar top edge regardless of safe-area-inset
+- All other FAB style properties unchanged (right, width, height, zIndex, etc.)
+
+**App.tsx** (contentStyle, lines 155–164):
+- Added phone-only spread: `...(phone ? { paddingBottom: 'var(--bottom-chrome-h)' } : {})`
+- Phone content area now reserves space equal to the BottomTabBar height
+- Desktop branch has no paddingBottom — geometry unchanged
+- Build: `pnpm --filter @familysync/pwa build` exits 0
+
+### Task 2: FAB↔BottomTabBar overlap regression assertion (layout.spec.ts)
+
+Added new `test.describe` block "D-01 regression guard — FAB does not overlap BottomTabBar":
+- Test name: "New Event FAB does not overlap BottomTabBar (A — phone only)"
+- Skips on desktop (`testInfo.project.name === 'desktop'`)
+- Locates FAB via `page.getByRole('button', { name: 'New Event' })` and bar via `page.getByRole('navigation', { name: 'Main navigation' })`
+- Asserts `fabBox.y + fabBox.height <= navBox.y` (FAB bottom ≤ BottomTabBar top)
+- Passes GREEN on iphone (390×844 WebKit) and pixel (412×915 Chromium)
+
+### Task 3: Small-viewport sweep across all three profiles
+
+- `pnpm --filter @familysync/pwa test:e2e` (all 3 profiles): **115 passed, 23 skipped, 0 failed**
+  - iphone profile: all layout.spec.ts assertions pass including new D-01 guard
+  - pixel profile: all layout.spec.ts assertions pass including new D-01 guard
+  - desktop profile: all layout.spec.ts assertions pass; D-01 guard correctly skipped
+- No violations flagged by Rules 1–4 assertions
+- Admin tab tap target still meets ≥44px after layout changes
+- Color-legend chips confirmed fully visible via playwright-cli screenshot at 390×844
+
+## Visual Confirmation (playwright-cli @390×844)
+
+Screenshot taken via playwright-cli (Chromium, viewport 390×844, reloaded to pick up phone layout):
+- **New Event FAB (+)**: clearly positioned above the BottomTabBar with visible gap
+- **Color-legend chips** ("Dev User" blue, "Family" pink): fully visible between calendar content and BottomTabBar — not clipped or occluded
+- **BottomTabBar** (Calendar, Lists, Admin): fully visible at the bottom edge
+
+## Verification Results
+
+| Check | Result |
+|-------|--------|
+| `grep 'calc(var(--bottom-chrome-h) + var(--space-6))'` in CalendarShell.tsx | PASS |
+| `grep "paddingBottom: 'var(--bottom-chrome-h)'"` in App.tsx | PASS |
+| `grep 'New Event FAB does not overlap BottomTabBar'` in layout.spec.ts | PASS |
+| `pnpm --filter @familysync/pwa build` | PASS |
+| Playwright iphone + pixel layout.spec.ts (overlap assertion) | PASS — 32 passed, 2 skipped |
+| Full 3-profile `pnpm --filter @familysync/pwa test:e2e` | PASS — 115 passed, 23 skipped, 0 failed |
+| playwright-cli visual confirmation @390×844 | PASS — FAB above bar, legend chips visible |
+| Desktop geometry unchanged | PASS — no desktop layout changes |
+
+## Deviations from Plan
+
+None. Plan executed exactly as written. The three-task sequence (CSS fix, regression guard, sweep) was completed without any deviations. The FAB bottom value, phone contentStyle spread pattern, and overlap assertion all match the plan specification exactly.
+
+## Known Stubs
+
+None. All changes are wired and fully functional.
+
+## Threat Flags
+
+None. CSS-only layout offsets plus a Playwright geometry test — no new network endpoints, auth paths, or data flows introduced.
+
+## Self-Check: PASSED
+
+| Item | Result |
+|------|--------|
+| CalendarShell.tsx exists | FOUND |
+| App.tsx exists | FOUND |
+| layout.spec.ts exists | FOUND |
+| SUMMARY.md exists | FOUND |
+| Commit 5e1c714 (Task 1) | FOUND |
+| Commit 85a803f (Task 2) | FOUND |
+| CalendarShell FAB bottom grep | PASS |
+| App.tsx paddingBottom grep | PASS |
+| layout.spec.ts overlap assertion grep | PASS |