Implement forced first-login setup and dropzone UX fixes

#4 Forced First-Login Setup:
- Add before_request hook to redirect to /setup if no users exist
- Skip redirect for static files and setup routes

#5 Dropzone UX Fixes:
- Make preview images clickable to replace file
- Make entire drop zone clickable
- QR zone resets after 2s on error, allowing retry
- Clear file input on error so same file can be re-selected

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

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

PLAN-4.1.2.md

@@ -167,21 +167,24 @@ Polish and UX improvements after the 4.1.1 stability release.
 
 ## 4. Forced First-Login Setup
 
-**Status:** Planned
+**Status:** Done
 
 **Problem:** Users can navigate the app without creating an admin account first. Should force password setup before anything else.
 
 **Solution:** Middleware/decorator that redirects to setup page if no users exist.
 
-### Files to Modify
-- `frontends/web/app.py` (add before_request check)
-- `frontends/web/templates/setup.html` (ensure it blocks other nav)
+### Implementation
+- Added `@app.before_request` hook that redirects to /setup if no users exist
+- Skips redirect for static files and setup-related routes
+
+### Files Modified
+- `frontends/web/app.py` (added require_setup before_request hook)
 
 ---
 
 ## 5. Dropzone UX Fixes
 
-**Status:** Planned
+**Status:** Done
 
 **Problem:** Dropzone has some interaction bugs:
 - Dropzone doesn't clear properly if first QR image fails
@@ -189,9 +192,14 @@ Polish and UX improvements after the 4.1.1 stability release.
 
 **Solution:** Fix JS event handling and state management
 
-### Files to Modify
+### Implementation
+- Added click handler on preview images to trigger file input
+- Made entire drop zone clickable (not just label)
+- QR zone now resets after 2 seconds on error, allowing retry
+- Clear file input on QR error so same file can be re-selected
+
+### Files Modified
 - `frontends/web/static/js/stegasoo.js`
-- `frontends/web/static/css/style.css` (clickable preview)
 
 ---
 
@@ -272,6 +280,6 @@ Polish and UX improvements after the 4.1.1 stability release.
 
 ## Notes
 
-- Keep 4.1.2 focused - 9 features (2 done)
+- Keep 4.1.2 focused - 9 features (4 done)
 - Don't break DCT compatibility (4.1.1 RS format is stable)
 - Test on Pi before release

frontends/web/app.py

@@ -192,6 +192,24 @@ app.config["HTTPS_ENABLED"] = os.environ.get("STEGASOO_HTTPS_ENABLED", "false").
 # Initialize auth module
 init_auth(app)
 
+
+@app.before_request
+def require_setup():
+    """Force redirect to setup if no users exist (first-run)."""
+    if not app.config.get("AUTH_ENABLED", True):
+        return None
+
+    # Skip for static files and setup-related routes
+    if request.endpoint in ("static", "setup", "setup_recovery", None):
+        return None
+
+    # If no users exist, redirect to setup
+    if not user_exists():
+        return redirect(url_for("setup"))
+
+    return None
+
+
 # Temporary file storage for sharing (file_id -> {data, timestamp, filename})
 TEMP_FILES: dict[str, dict] = {}
 THUMBNAIL_FILES: dict[str, bytes] = {}

frontends/web/static/js/stegasoo.js

@@ -99,6 +99,23 @@ const Stegasoo = {
                     }
                 });
             }
+
+            // Make preview clickable to replace file
+            if (preview) {
+                preview.style.cursor = 'pointer';
+                preview.addEventListener('click', (e) => {
+                    e.stopPropagation();
+                    input.click();
+                });
+            }
+
+            // Make entire zone clickable (in case label/preview don't cover it)
+            zone.addEventListener('click', (e) => {
+                // Only trigger if not clicking directly on the input
+                if (e.target !== input) {
+                    input.click();
+                }
+            });
         });
     },
     
@@ -584,6 +601,17 @@ const Stegasoo = {
                         <span>No QR code detected</span>
                     `;
                 }
+
+                // Reset after delay so user can try again
+                setTimeout(() => {
+                    container.classList.remove('error');
+                    container.classList.add('d-none');
+                    label?.classList.remove('d-none');
+                    // Clear the file input so same file can be re-selected
+                    input.value = '';
+                    // Remove loader
+                    if (loader) loader.remove();
+                }, 2000);
             });
         });
     },