chore: ratatui 0.30 maintenance + collaboration baseline (#1)

.github/pull_request_template.md

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+## Problem
+Describe the user-visible problem this PR solves.
+
+## Change Summary
+List the key code and behavior changes.
+
+## Test Evidence
+- [ ] `cargo fmt --check`
+- [ ] `cargo clippy --all-targets -- -D warnings`
+- [ ] `cargo check`
+- [ ] `cargo test`
+
+## Breaking Changes
+Describe any API or behavior changes that may break existing users.