chore: triage KNOWN_ISSUES.md and convert suggestions to issues

- Created new issue drafts in `issues/` for test isolation, flakiness, and hooks.
- Updated `KNOWN_ISSUES.md` to remove resolved/historical items and link to new issues.
- Kept active environment quirks in `KNOWN_ISSUES.md`.

Co-authored-by: PR0M3TH3AN <[email protected]>

issues/pre-commit-hooks.md

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+# Implement Pre-commit Hooks
+
+**Suggestion:**
+Implement a pre-commit hook that runs the linter and potentially the build to ensure generated files are in sync, or configure CI to fail if they are not.

issues/test-env-isolation.md

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+# Test Environment Isolation & Dockerized Testing
+
+**Problem:**
+Debugging visual test failures was difficult without access to the live browser UI or artifacts. The reproduction script failed due to environment restrictions on launching browsers.
+
+**Suggestion:**
+Running tests in a consistent Docker container with Xvfb properly configured would help reproduce environment-specific failures locally.

issues/test-flakiness.md

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+# Test Flakiness (Modals)
+
+**Problem:**
+E2E tests for modals are prone to timeouts, likely due to animation/transition handling or resource loading delays in the CI environment. Using `applyReducedMotion` consistently helps but doesn't solve all timing issues.

issues/visual-testing-improvements.md

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+# Visual Testing Improvements
+
+**Suggestion:**
+Ensure that test fixtures (like `moderation/fixtures/index.html`) correctly force UI updates after state injection to avoid race conditions.