Fix: Manual swipe now counts as interaction for inactivity prompt

CRITICAL FIX: Manual swipes to 0-time pages now trigger inactivity prompts.

The problem:
- User swipes to a 0-time (manual) page but doesn't touch it
- userInteractedWithCurrentSite stays false
- No inactivity prompt ever appears
- Kiosk stuck on that page forever

The fix:
- Manual swipe now explicitly sets userInteractedWithCurrentSite=true
- Swipe counts as engagement with the new page
- After inactivity timeout, prompt appears even if user never touched page
- Ensures "Return to Rotation" mechanism works on ALL pages

Complete flow now works as designed:
1. Normal rotation with duration > 0 sites
2. User interacts with ANY site → rotation pauses
3. After 2min inactivity → prompt appears
   - "Return to Rotation" → returns to home, resumes rotation
   - "I'm still here" → waits another 2min, prompt again
   - Time extension (5/15/30/60 min) → waits that long, prompt again
   - No response (15 sec) → auto-returns to rotation
4. User swipes to new page → counts as interaction, rotation resumes
5. Media playing → blocks all rotation and prompts (30s grace period)
6. Display schedule → screen blanks, app keeps running
7. Password/lockout → takes precedence on boot/resume/timeout

Technical changes:
- Lines 4072-4075: Set userInteractedWithCurrentSite=true in nextTab()
- Lines 4097-4100: Set userInteractedWithCurrentSite=true in prevTab()
- Ensures inactivity logic works even on untouched 0-time pages

This completes the comprehensive rotation/inactivity system.

install_kiosk_v0.9.10.sh

@@ -4068,6 +4068,11 @@ function nextTab(){
   // v0.9.10: Manual swipe RESUMES rotation on new page
   // This is navigation, not content interaction - set AFTER markActivity
   manualNavigationMode=false;
+
+  // v0.9.10: Manual swipe counts as interaction with new page
+  // This ensures inactivity prompt will fire even on 0-time pages
+  // If user swipes to page B but never touches it, prompt still appears after timeout
+  userInteractedWithCurrentSite=true;
   console.log('[MANUAL] User switched tab forward → manualNavigationMode=FALSE (rotation will resume)');
 }
 
@@ -4088,6 +4093,11 @@ function prevTab(){
   // v0.9.10: Manual swipe RESUMES rotation on new page
   // This is navigation, not content interaction - set AFTER markActivity
   manualNavigationMode=false;
+
+  // v0.9.10: Manual swipe counts as interaction with new page
+  // This ensures inactivity prompt will fire even on 0-time pages
+  // If user swipes to page B but never touches it, prompt still appears after timeout
+  userInteractedWithCurrentSite=true;
   console.log('[MANUAL] User switched tab backward → manualNavigationMode=FALSE (rotation will resume)');
 }