Fix SW scope to intercept page navigations for offline support

The SW was served from /static/sw.js with default scope /static/,
so it only intercepted static asset requests. Page navigations to
/capture, /queue, /browser were not handled by the SW at all —
Safari showed its native offline error.

Fix: serve SW from /sw.js route with Service-Worker-Allowed: / header
and register with scope: /. Now the SW intercepts all navigations and
serves the offline fallback page when the network is unavailable.

Also remove auth-protected page routes from precache (they would cache
the login redirect). Pages are cached via network-first on visit instead.

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

app/routes/views.py

@@ -1,7 +1,19 @@
-from flask import Blueprint, render_template, redirect, url_for, session, jsonify
+from flask import Blueprint, render_template, redirect, url_for, session, jsonify, send_from_directory, current_app
 
 bp = Blueprint('views', __name__)
 
+
+@bp.route('/sw.js')
+def service_worker():
+    """Serve service worker from root scope."""
+    response = send_from_directory(
+        current_app.static_folder, 'sw.js',
+        mimetype='application/javascript'
+    )
+    response.headers['Service-Worker-Allowed'] = '/'
+    response.headers['Cache-Control'] = 'no-cache'
+    return response
+
 @bp.route('/')
 def index():
     """Root route - redirect to capture if logged in, otherwise show login."""