Add slide number to presentation mode route

- Update route to /presentations/:presentationId/present/:slideNumber
- Add URL-synced navigation with goToSlide function
- Update keyboard navigation to maintain URL state
- Enable deep linking and browser navigation for slides
- Start presentation from slide 1 in presentations list
- Present button in viewer uses current slide number

🤖 Generated with [Claude Code](https://claude.ai/code)

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

src/App.tsx

@@ -26,7 +26,7 @@ function App() {
             <Route path="/presentations/new" element={<NewPresentationPage />} />
             <Route path="/presentations/:presentationId/edit/slides/:slideNumber" element={<PresentationEditor />} />
             <Route path="/presentations/:presentationId/view/slides/:slideNumber" element={<PresentationViewer />} />
-            <Route path="/presentations/:presentationId/present" element={<PresentationMode />} />
+            <Route path="/presentations/:presentationId/present/:slideNumber" element={<PresentationMode />} />
             <Route path="/presentations/:presentationId/slide/:slideId/edit" element={<SlideEditor />} />
             <Route path="/themes" element={<ThemeBrowser />} />
             <Route path="/themes/:themeId" element={<ThemeDetailPage />} />

src/components/presentations/PresentationMode.tsx

@@ -10,15 +10,29 @@ import { loggers } from '../../utils/logger.ts';
 import './PresentationMode.css';
 
 export const PresentationMode: React.FC = () => {
-  const { presentationId } = useParams<{ presentationId: string }>();
+  const { presentationId, slideNumber } = useParams<{ 
+    presentationId: string; 
+    slideNumber: string; 
+  }>();
   const navigate = useNavigate();
   
   const [presentation, setPresentation] = useState<Presentation | null>(null);
   const [theme, setTheme] = useState<Theme | null>(null);
-  const [currentSlideIndex, setCurrentSlideIndex] = useState(0);
+  const [currentSlideIndex, setCurrentSlideIndex] = useState(
+    slideNumber ? parseInt(slideNumber, 10) - 1 : 0
+  );
   const [loading, setLoading] = useState(true);
   const [error, setError] = useState<string | null>(null);
   
+  // Navigate to specific slide and update URL
+  const goToSlide = (slideIndex: number) => {
+    if (!presentation) return;
+    
+    const clampedIndex = Math.max(0, Math.min(slideIndex, presentation.slides.length - 1));
+    setCurrentSlideIndex(clampedIndex);
+    navigate(`/presentations/${presentationId}/present/${clampedIndex + 1}`, { replace: true });
+  };
+  
   // Keyboard navigation handler
   const handleKeyPress = useCallback((event: KeyboardEvent) => {
     if (!presentation || presentation.slides.length === 0) return;
@@ -28,24 +42,22 @@ export const PresentationMode: React.FC = () => {
       case 'Space':
       case 'Enter':
         event.preventDefault();
-        setCurrentSlideIndex(prev => 
-          Math.min(prev + 1, presentation.slides.length - 1)
-        );
+        goToSlide(currentSlideIndex + 1);
         break;
         
       case 'ArrowLeft':
         event.preventDefault();
-        setCurrentSlideIndex(prev => Math.max(prev - 1, 0));
+        goToSlide(currentSlideIndex - 1);
         break;
         
       case 'Home':
         event.preventDefault();
-        setCurrentSlideIndex(0);
+        goToSlide(0);
         break;
         
       case 'End':
         event.preventDefault();
-        setCurrentSlideIndex(presentation.slides.length - 1);
+        goToSlide(presentation.slides.length - 1);
         break;
         
       case 'Escape':
@@ -55,14 +67,24 @@ export const PresentationMode: React.FC = () => {
         
       default:
         // Handle number keys for direct slide navigation
-        const slideNumber = parseInt(event.key);
-        if (slideNumber >= 1 && slideNumber <= presentation.slides.length) {
+        const slideNum = parseInt(event.key);
+        if (slideNum >= 1 && slideNum <= presentation.slides.length) {
           event.preventDefault();
-          setCurrentSlideIndex(slideNumber - 1);
+          goToSlide(slideNum - 1);
         }
         break;
     }
-  }, [presentation, navigate, presentationId]);
+  }, [presentation, currentSlideIndex, goToSlide]);
+  
+  // Sync current slide index with URL parameter
+  useEffect(() => {
+    if (slideNumber) {
+      const newIndex = parseInt(slideNumber, 10) - 1;
+      if (newIndex >= 0 && newIndex !== currentSlideIndex) {
+        setCurrentSlideIndex(newIndex);
+      }
+    }
+  }, [slideNumber]);
   
   // Set up keyboard listeners
   useEffect(() => {

src/components/presentations/PresentationViewer.tsx

@@ -86,7 +86,7 @@ export const PresentationViewer: React.FC = () => {
 
   const enterPresentationMode = () => {
     if (!presentation) return;
-    navigate(`/presentations/${presentationId}/present`);
+    navigate(`/presentations/${presentationId}/present/${currentSlideIndex + 1}`);
   };
 
   if (loading) {

src/components/presentations/PresentationsList.tsx

@@ -213,7 +213,7 @@ export const PresentationsList: React.FC = () => {
                     <button
                       type="button"
                       className="card-action secondary"
-                      onClick={() => navigate(`/presentations/${presentation.metadata.id}/present`)}
+                      onClick={() => navigate(`/presentations/${presentation.metadata.id}/present/1`)}
                     >
                       Present
                     </button>