Fix: memory and context views mobile friendly (#818)

* Changes from fix/memory-and-context-mobile-friendly

* fix: Improve file extension detection and add path traversal protection

* refactor: Extract file extension utilities and add path traversal guards

Code review improvements:
- Extract isMarkdownFilename and isImageFilename to shared image-utils.ts
- Remove duplicated code from context-view.tsx and memory-view.tsx
- Add path traversal guard for context fixture utilities (matching memory)
- Add 7 new tests for context fixture path traversal protection
- Total 61 tests pass

Addresses code review feedback from PR #813

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

* test: Add e2e tests for profiles crud and board background persistence

* Update apps/ui/playwright.config.ts

Co-authored-by: coderabbitai[bot] <136622811+coderabbitai[bot]@users.noreply.github.com>

* fix: Add robust test navigation handling and file filtering

* fix: Format NODE_OPTIONS configuration on single line

* test: Update profiles and board background persistence tests

* test: Replace iPhone 13 Pro with Pixel 5 for mobile test consistency

* Update apps/ui/src/components/views/context-view.tsx

Co-authored-by: coderabbitai[bot] <136622811+coderabbitai[bot]@users.noreply.github.com>

* chore: Remove test project directory

* feat: Filter context files by type and improve mobile menu visibility

---------

Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>
Co-authored-by: coderabbitai[bot] <136622811+coderabbitai[bot]@users.noreply.github.com>

.gitignore

@@ -65,6 +65,11 @@ coverage/
 *.lcov
 playwright-report/
 blob-report/
+test/**/test-project-[0-9]*/
+test/opus-thinking-*/
+test/agent-session-test-*/
+test/feature-backlog-test-*/
+test/running-task-display-test-*/
 
 # Environment files (keep .example)
 .env