chore(demo): add clear all notifications button and update project config

.cursor/rules/bun.mdc

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+---
+description: Use Bun instead of Node.js, npm, pnpm
+globs: '*.ts, *.tsx, *.html, *.css, *.js, *.jsx, package.json'
+alwaysApply: false
+---
+
+Default to using Bun instead of Node.js.
+
+- Use `bun <file>` instead of `node <file>` or `ts-node <file>`
+- Use `bun build <file.html|file.ts|file.css>` instead of `webpack` or `esbuild`
+- Use `bun install` instead of `npm install` or `yarn install` or `pnpm install`
+- Use `bun run <script>` instead of `npm run <script>` or `yarn run <script>` or `pnpm run <script>`
+- Use `bunx <package> <command>` instead of `npx <package> <command>`
+- Bun automatically loads .env, so don't use dotenv.

.cursor/rules/pr-conventions.mdc

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+---
+description: Conventions for pull request titles and body content
+alwaysApply: true
+---
+
+# Pull Request Conventions
+
+## PR Title
+
+Use semantic/conventional commit prefixes in PR titles:
+
+- `fix:` for bug fixes
+- `feat:` for new features
+- `chore:` for maintenance tasks (deps, CI, tooling)
+- `refactor:` for code restructuring without behavior changes
+- `docs:` for documentation-only changes
+- `test:` for test-only changes
+
+Example: `fix: resolve notification grouping on Android 14`
+
+## PR Body
+
+Follow the repo's PR template at `.github/pull_request_template.md`. Every PR body must include:
+
+1. **One Line Summary** (required)
+2. **Motivation** (required) explaining why the change is being made
+3. **Scope** (recommended) describing what is and isn't affected
+4. **Testing** section with manual and/or unit testing details
+5. **Affected code checklist** with relevant items checked
+6. **Checklist** sections confirmed
+
+Remove the instructional header block (between `<!-- START -->` and `<!-- END -->`) before submitting.