feat: add delete confirmation dialog and improve accessibility in MemoryPanel and ThreadList components

.github/PULL_REQUEST_TEMPLATE.md

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+<!-- Fill this out before submitting. New features / changes require peer review + manual testing before merge. -->
+
+## What & why
+
+<!-- What does this PR change, and why? -->
+
+## Manual testing
+
+> Must be tested against a real backend (`EvoSci deploy`, port 6174) — a green build is not enough.
+
+- [ ] `npm run lint && npm run format:check && npm run build` all green
+- [ ] Started the backend → configured the Deployment URL → chat works
+- [ ] The feature(s) touched here were verified to work (Workspace / Skills / Memory / theme / chat …)
+- [ ] Significant changes re-tested against the production build (`npm run build && npm start`; dev and standalone behave differently)
+
+### Test steps / screenshots
+
+<!-- How you tested it; attach screenshots or a screen recording. -->
+
+## Checklist
+
+- [ ] Self-tested, no obvious regressions
+- [ ] Updated `CLAUDE.md` for any significant architecture / decision changes
+- [ ] Requested at least one teammate for **peer review**
+
+---
+
+> Merging ≠ shipping: releases are handled solely by Xi Zhang (EvoScientist pulls the UI via `@latest`).