feat(auth,docs): add AGENTS guidelines, consistency kit, particle background, solid card, logo swap, header toggles, signup password rules, and phone input border fix

.github/PULL_REQUEST_TEMPLATE.md

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+## Summary
+Closes #
+
+## Scope
+- What/why in 1–2 sentences
+- Affected areas (files, routes, components)
+
+## Screenshots / Videos
+If UI changed, include before/after and dark mode.
+
+## Checklist
+- [ ] Build OK
+- [ ] Lint OK
+- [ ] Tests added/updated and passing
+- [ ] A11y checked (labels, roles, keyboard, focus)
+- [ ] Handles states (loading/empty/error)
+- [ ] Dark mode verified
+- [ ] Docs updated (AGENTS.md or component README where relevant)
+