[chore] panel: prettier reformat across the codebase

Apply `pnpm format` (prettier 3.8.5, 80-col / double-quote / semi /
trailing-comma-all) to the 223 pre-existing panel files that predated the
prettier infra added in cb5365a4. Pure formatting — no semantic changes:
multi-line arrays/objects collapsed where they fit, trailing newlines added
(.prettierrc.json), import grouping unchanged.

Verified: `pnpm format:check` clean, `pnpm lint` clean, `pnpm typecheck`
clean, `pnpm test` 113/113 pass (7 files).

panel/.prettierrc.json

@@ -7,4 +7,4 @@
   "arrowParens": "always",
   "bracketSpacing": true,
   "endOfLine": "lf"
-}
+}