docs(planning): W5-IOS-WORKOUTS-DEDUP + DESIGN-POLISH v1.4.42 phase report

.planning/phase-W5-IOS-WORKOUTS-v1442-report.md

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+# W5-IOS-WORKOUTS-DEDUP + DESIGN-POLISH — v1.4.42 phase report
+
+Worktree: `worktree-agent-a078968e699ec5621`
+Branched from `develop` tip `d3d60104` (v1.4.41 QA closure)
+Two atomic commits: `9af4bbb6` (workouts), `db9c6296` (dashboard).
+
+## Scope landed
+
+### 1. `pickCanonicalWorkoutRows()` — write-time cross-source dedup
+- `src/lib/workouts/canonical-rows.ts` — new pure helper, no Prisma /
+  no IO. Groups by `(userId, activityType, startedAt ± 90 s)`; prefers
+  the canonical source ladder `APPLE_HEALTH > WITHINGS > MANUAL >
+  IMPORT`; breaks ties on calories > earliest createdAt > input
+  order. Re-uses `DEFAULT_WORKOUT_SOURCE_PRIORITY` from
+  `src/lib/sources/pick-canonical-workout.ts` so both write-time and
+  read-time pickers consult a single ladder constant. (Scope memo
+  mentioned `STRAVA_IMPORT`; the actual enum has only `IMPORT` — the
+  scope wording maps to that bucket, documented in the helper header.)
+- `src/lib/workouts/__tests__/canonical-rows.test.ts` — twelve cases
+  pinning: empty input, exact same-source dup, cross-source overlap
+  inside window, no-overlap pass-through, multi-user isolation,
+  multi-activityType isolation, calories tie-breaker, createdAt tie-
+  breaker, input-order determinism, ±90 s boundary inclusivity,
+  full-ladder walk, no-caller-mutation invariant.
+- `src/app/api/workouts/batch/route.ts` — wired pre-`createMany`.
+  Survivors carry through to the existing dedup-by-externalId pass;
+  dropped twins surface as `duplicate` in the per-entry envelope so
+  the iOS sync cursor advances past them identically.
+- `src/app/api/workouts/__tests__/batch-create.test.ts` — three
+  pre-existing tests updated to space their two-row payloads outside
+  the 90 s window (they exercised per-entry envelope semantics, not
+  cross-source dedup; collision with the new W5 pass would have
+  masked the intended pin).
+
+### 2. Dashboard tile-strip placeholder polish
+- `src/app/page.tsx` ~line 1428 — fallback className extended:
+  `flex h-full min-h-[6rem] w-full min-w-0 flex-col` added to the
+  existing `bg-card border-border rounded-xl border p-4 md:p-6`.
+  Matches the live `TrendCard` chrome (`src/components/charts/
+  trend-card.tsx:241`) byte-for-byte. `min-h-[6rem]` holds the row
+  open during an all-suspend transition; the chrome utilities keep
+  the placeholder visually identical to a settled tile.
+- Structural test pin keys on `aria-hidden="true"`, not the
+  className → stays green without modification.
+
+## Quality gates (all green)
+
+- `pnpm typecheck` — clean.
+- `pnpm lint` — clean.
+- `pnpm test --run` (full suite) — **4744 passed | 1 skipped**.
+- Scoped `pnpm test --run src/lib/workouts
+  src/app/__tests__/dashboard-suspense-boundaries.test.ts
+  src/app/api/workouts` — 44 passed.
+
+## Strict rules honoured
+
+- Stayed in worktree throughout.
+- Did not touch: knip config, dashboard widget routes, api-response,
+  settings/medications/admin/integrations components, hook files, tz
+  resolver, insights status modules, doctor-report-data.
+- Only touched the placeholder className lines in `src/app/page.tsx`
+  — no other comments / Suspense / RSC code modified (W4 owns those).
+- No `Co-Authored-By: Claude`. No `--no-verify`. No `--no-gpg-sign`.
+  No "Marc" in commit messages. Conventional-commit prefixes:
+  `feat(workouts):` and `style(dashboard):`.