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.

.claude/skills/playwright-cli/references/session-management.md

@@ -21,6 +21,7 @@ playwright-cli -s=public snapshot
 ## Browser Session Isolation Properties
 
 Each browser session has independent:
+
 - Cookies
 - LocalStorage / SessionStorage
 - IndexedDB