chore: update .gitignore and improve coding standards documentation

- Added .cursor/sessions/* to .gitignore to prevent session files from being tracked.
- Enhanced coding standards in SKILL.md by adding semicolons to TypeScript examples for consistency.
- Improved formatting in continuous learning, detail layout, and other SKILL.md files for better readability.

These changes aim to streamline development processes and maintain code quality across the project.

.cursor/commands/update-docs.md

@@ -3,12 +3,15 @@
 Sync docs with this frontend monorepo. Source of truth: `package.json`, `apps/web/.env.example`, and `apps/docs-dev` (VitePress).
 
 1. Read root `package.json` scripts
+
    - Table of `pnpm dev:web`, `pnpm dev:showcase`, `pnpm dev:docs-dev`, `pnpm typecheck:web`, `pnpm test`, `pnpm check:all`
 
 2. Read `apps/web/.env.example`
+
    - Document each `VITE_*` var (they are public to the client)
 
 3. Update `apps/docs-dev` (VitePress) and the root README
+
    - Where to work (`apps/web` vs `showcase`)
    - Module layout (`example/full-page`)
    - Preferred `@repo/*` imports