docs: update KNOWN_ISSUES.md and triage environment issues

- Update KNOWN_ISSUES.md to reflect current environment status (missing devDependencies).
- Create issues/test-env-deps.md to document missing dependencies preventing test runs.
- Create issues/popover-flip-bug.md to document the persistent popover flip bug.
- Update timestamps and references in KNOWN_ISSUES.md.

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

issues/popover-flip-bug.md

@@ -0,0 +1,37 @@
+# Popover Flip Bug in Constrained Viewports
+
+## Problem
+
+The popover (using Floating UI `flip` middleware) fails to respect viewport boundaries in constrained height scenarios, causing it to overlap or be cut off instead of flipping to the top.
+
+## Affected Components
+
+- `js/ui/overlay/popoverEngine.js`
+- Popovers triggered from `data-test-trigger="grid-bottom-right"` (e.g., in `tests/e2e/popover.spec.ts`).
+
+## Reproduction Steps
+
+1. Open a popover near the bottom of a constrained viewport.
+2. Ensure there is enough space above the popover to flip.
+3. Observe that the popover stays at the bottom and is clipped.
+
+## Test Case
+
+- `tests/e2e/popover.spec.ts`: "keeps the bottom-right grid menu inside the viewport" (skipped).
+
+## History
+
+- **2025-02-23**: Verification failed. Fix attempt failed.
+- **2026-02-08**: Verification attempted but failed due to missing environment dependencies (`@playwright/test`).
+
+## Possible Causes
+
+- Misconfiguration of `flip` middleware (padding, boundary).
+- Conflict with `shift` middleware.
+- Viewport detection issues in constrained test environment.
+
+## Tags
+
+- ui
+- bug
+- floating-ui

issues/test-env-deps.md

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+# Test Environment Missing Dependencies
+
+## Problem
+
+The current development environment is missing several `devDependencies` that are listed in `package.json`. This prevents running certain test suites.
+
+## Affected Dependencies
+
+- `jsdom`: Required for `tests/app/channel-profile-moderation.test.mjs`.
+- `fake-indexeddb`: Required for `test:dm:unit` and `test:dm:integration`.
+- `@playwright/test` (and `playwright`): Required for E2E tests (`test:e2e`, `tests/e2e/popover.spec.ts`, etc.) and visual regression tests (`test:visual`).
+
+## Impact
+
+- `npm run test:unit` fails partially (`tests/app/channel-profile-moderation.test.mjs` fails with `ERR_MODULE_NOT_FOUND`).
+- `npm run test:dm:unit` fails completely.
+- `npm run test:dm:integration` fails completely.
+- `npm run test:e2e` fails completely.
+- `npm run test:visual` fails completely.
+
+## Notes
+
+- `npm install` is restricted in this environment, preventing easy re-installation.
+- This issue was verified on 2026-02-08.
+
+## Tags
+
+- environment
+- testing
+- dependencies