style(13-03): apply Prettier formatting across repo

Mechanical reformat — no logic changes. 398 files changed, 19125
insertions(+), 16457 deletions(-). Prettier 3.8.4 with .prettierrc
(singleQuote:true, semi:true, tabWidth:2, trailingComma:all,
printWidth:100). Isolated per D-13-08 for reviewability.

.planning/milestones/v1.0-phases/06-ux-polish/06-01-PLAN.md

@@ -11,20 +11,20 @@ autonomous: true
 requirements: []
 must_haves:
   truths:
-    - "On any start change, the event end preserves its current duration (D-04)"
-    - "The end never strands behind the start day — at worst it snaps to the same day/+1h (D-04 floor)"
+    - 'On any start change, the event end preserves its current duration (D-04)'
+    - 'The end never strands behind the start day — at worst it snaps to the same day/+1h (D-04 floor)'
   artifacts:
-    - path: "apps/pwa/src/lib/eventDateTime.ts"
-      provides: "computeNewTimedEnd + computeNewAllDayEnd pure end-tracking helpers"
-      contains: "computeNewTimedEnd"
-    - path: "apps/pwa/src/lib/eventDateTime.test.ts"
-      provides: "RED-then-GREEN unit coverage for duration preservation + floor rule"
-      contains: "computeNewTimedEnd (D-04"
+    - path: 'apps/pwa/src/lib/eventDateTime.ts'
+      provides: 'computeNewTimedEnd + computeNewAllDayEnd pure end-tracking helpers'
+      contains: 'computeNewTimedEnd'
+    - path: 'apps/pwa/src/lib/eventDateTime.test.ts'
+      provides: 'RED-then-GREEN unit coverage for duration preservation + floor rule'
+      contains: 'computeNewTimedEnd (D-04'
   key_links:
-    - from: "apps/pwa/src/lib/eventDateTime.ts"
-      to: "apps/pwa/src/lib/eventDateTime.test.ts"
-      via: "vitest unit assertions"
-      pattern: "computeNewTimedEnd|computeNewAllDayEnd"
+    - from: 'apps/pwa/src/lib/eventDateTime.ts'
+      to: 'apps/pwa/src/lib/eventDateTime.test.ts'
+      via: 'vitest unit assertions'
+      pattern: 'computeNewTimedEnd|computeNewAllDayEnd'
 ---
 
 <objective>
@@ -52,10 +52,11 @@ Output: `computeNewTimedEnd` and `computeNewAllDayEnd` exported from `eventDateT
 
 <artifacts_this_plan_produces>
 NEW symbols introduced here (exclude from any drift/convergence check — they did not exist before this phase):
+
 - `computeNewTimedEnd(newStartDate, newStartTime, oldStartDate, oldStartTime, oldEndDate, oldEndTime): { endDate, endTime }` in `apps/pwa/src/lib/eventDateTime.ts`
 - `computeNewAllDayEnd(newStartDate, oldStartDate, oldEndDate): string` in `apps/pwa/src/lib/eventDateTime.ts`
 - Any private date helpers these need (e.g. `dateDiffDays`, `addDaysISO`, `localDateISO`, `localTimeHHMM`) — add only if not already present in the file; reuse existing local-accessor helpers where they exist.
-</artifacts_this_plan_produces>
+  </artifacts_this_plan_produces>
 
 <tasks>
 
@@ -116,17 +117,19 @@ NEW symbols introduced here (exclude from any drift/convergence check — they d
 </tasks>
 
 <threat_model>
+
 ## Trust Boundaries
 
-| Boundary | Description |
-|----------|-------------|
+| Boundary   | Description                                                                                                           |
+| ---------- | --------------------------------------------------------------------------------------------------------------------- |
 | (none new) | Pure client-side date arithmetic on already-trusted local form state. No network, no untrusted input, no persistence. |
 
 ## STRIDE Threat Register
 
-| Threat ID | Category | Component | Disposition | Mitigation Plan |
-|-----------|----------|-----------|-------------|-----------------|
-| T-06-01 | Tampering | computeNewTimedEnd / computeNewAllDayEnd | accept | Pure functions over local strings; no trust boundary crossed. Output is re-validated downstream by the existing serialize/write path (vevent.ts WR-04). UI/logic only — no new attack surface. |
+| Threat ID | Category  | Component                                | Disposition | Mitigation Plan                                                                                                                                                                                |
+| --------- | --------- | ---------------------------------------- | ----------- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
+| T-06-01   | Tampering | computeNewTimedEnd / computeNewAllDayEnd | accept      | Pure functions over local strings; no trust boundary crossed. Output is re-validated downstream by the existing serialize/write path (vevent.ts WR-04). UI/logic only — no new attack surface. |
+
 </threat_model>
 
 <verification>
@@ -136,10 +139,11 @@ NEW symbols introduced here (exclude from any drift/convergence check — they d
 </verification>
 
 <success_criteria>
+
 - D-04 duration-preservation and floor rules are encoded as passing unit tests.
 - Two exported helpers are available for Plan 06 to wire into EventForm.
 - No EventForm or write-path file touched (clean ownership for parallel Wave 1).
-</success_criteria>
+  </success_criteria>
 
 <output>
 Create `.planning/phases/06-ux-polish/06-01-SUMMARY.md` when done (RED/GREEN/REFACTOR notes + commit list).