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>

apps/ui/tests/utils/git/worktree.ts

@@ -381,7 +381,7 @@ export async function setupProjectWithPath(page: Page, projectPath: string): Pro
     localStorage.setItem('automaker-setup', JSON.stringify(setupState));
 
     // Disable splash screen in tests
-    sessionStorage.setItem('automaker-splash-shown', 'true');
+    localStorage.setItem('automaker-disable-splash', 'true');
   }, projectPath);
 }
 
@@ -435,7 +435,7 @@ export async function setupProjectWithPathNoWorktrees(
     localStorage.setItem('automaker-setup', JSON.stringify(setupState));
 
     // Disable splash screen in tests
-    sessionStorage.setItem('automaker-splash-shown', 'true');
+    localStorage.setItem('automaker-disable-splash', 'true');
   }, projectPath);
 }
 
@@ -493,7 +493,7 @@ export async function setupProjectWithStaleWorktree(
     localStorage.setItem('automaker-setup', JSON.stringify(setupState));
 
     // Disable splash screen in tests
-    sessionStorage.setItem('automaker-splash-shown', 'true');
+    localStorage.setItem('automaker-disable-splash', 'true');
   }, projectPath);
 }