fix: implement legacy profile guard behavior (redirect to home)

Based on legacy app (web/app/assets/javascripts/wizard/gear_utils.js):

When canPlayWithOthers() fails (single-player profile detected):
- Legacy app shows dialog with options:
  * Create private session → redirects to new session
  * Go to audio settings → redirects to /account/audio
  * Cancel → redirects to home

Current implementation (without dialog):
- Reject with error.controlled_location = false
- Redirect to home (/client) when profile check fails
- Prevents user from joining with inadequate audio profile

This matches legacy behavior of kicking user back to home, but
WITHOUT the dialog that explains why or offers alternatives.

TODO: Add JKSessionProfileDialog component with same options as
legacy 'single-player-profile-dialog' for better UX.

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

jam-ui/src/components/client/JKSessionScreen.js

@@ -376,10 +376,13 @@ const JKSessionScreen = () => {
 
             } catch (error) {
               logger.error("User profile is not appropriate for session:", error);
+              // If error doesn't control navigation, redirect to home (legacy behavior)
               if (!error?.controlled_location) {
-                // Handle error without controlled_location
-                // Session leave will be triggered by outer catch block
+                logger.debug("Profile guard failed, redirecting to home");
+                history.push('/client');
+                return; // Don't continue with session join
               }
+              // If controlled_location is true, the error handler already redirected
             }
           } catch (error) {
             logger.error("Error: waiting for session page enter to complete:", error);

jam-ui/src/hooks/useGearUtils.js

@@ -486,8 +486,16 @@ const useGearUtils = () => {
       const canPlayResult = await canPlayWithOthers();
 
       if (!canPlayResult.canPlay) {
-        const error = new Error('Cannot play with others - profile check failed');
+        // TODO: Show dialog like legacy app with options:
+        // - Create private session (controlled_location: true, redirect to new session)
+        // - Go to audio settings (controlled_location: true, redirect to /account/audio)
+        // - Cancel (controlled_location: false, redirect to home)
+
+        // For now, mimic legacy behavior: reject and let caller redirect to home
+        const error = new Error('Cannot play with others - single player profile detected');
         error.canPlayResult = canPlayResult;
+        error.controlled_location = false; // Let caller handle redirect
+        error.reason = 'single_player_profile';
         reject(error);
       } else {
         resolve();