ci: add pull request template

.github/pull_request_template.md

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+## What does this PR do?
+
+Explain here what you changed and why. Doesn't need to be long, just enough
+for a reviewer to understand the change without reading every line of
+diff. If it was a bug fix, briefly describe what was broken. Delete this paragraph and replace it with your description.
+
+## Closes
+
+List any issues that are linked to this pull request (e.g., `Closes #123`).
+
+- Closes #
+
+## Type of change(s)
+
+- [ ] Bug fix
+- [ ] New feature
+- [ ] Documentation update
+- [ ] Style / UI change
+- [ ] Refactor (no functional change)
+- [ ] Performance improvement
+- [ ] Other
+
+## Checklist
+
+- [ ] I've tested this change locally and it works as expected
+- [ ] `bun run build` or `npm run build` completes without errors
+- [ ] My commit messages follow [Conventional Commits](https://www.conventionalcommits.org/) (e.g. `fix: ...`, `feat: ...`, `chore: ...`)
+- [ ] I've updated relevant docs (README, comments, etc.) if this change needs it
+- [ ] No leftover `console.log` or debug code
+
+## Screenshots / recordings (if applicable)
+
+If this changes anything visual, a before/after screenshot or a short clip makes review a lot faster. Delete this section if it doesn't apply.
+
+## Anything else the reviewer should know?
+
+Extra context, known limitations, or specific things you'd like a
+second opinion on. Delete this section if there's nothing to add.