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/03-event-write-back-pwa-install/03-07-SUMMARY.md

@@ -124,6 +124,7 @@ None — plan executed exactly as written. Icon generation method (pure Node.js
 ## Threat Surface Scan
 
 No new security-relevant surface introduced beyond what was in the threat model:
+
 - T-03-20 (SW intercepts /callback): **mitigated** — `navigateFallbackDenylist` confirmed in vite.config.ts
 - T-03-21 (SW caches API responses): **mitigated** — `runtimeCaching: []`
 - T-03-22 (icons/manifest leak secrets): **accepted** — static public assets only
@@ -142,5 +143,6 @@ No new security-relevant surface introduced beyond what was in the threat model:
 - Commit `e0fb34b` — verified in git log
 
 ---
-*Phase: 03-event-write-back-pwa-install*
-*Completed: 2026-06-05*
+
+_Phase: 03-event-write-back-pwa-install_
+_Completed: 2026-06-05_