fix(web): restore scoped view transitions

[samuelloranger]

Summary

• restore TanStack Router's native typed view-transition driver
• scope document snapshots to content while leaving the sidebar live
• limit typed folder navigation to the file-list body, with a safe no-animation fallback

Verification

• bun test --parallel (153 passing)
• bun run lint
• bun run typecheck
• bun run build