refactor: optimize audio initialization and fix agent interactions

- Lazy initialize audio (on-demand instead of mount) in both player and Speechmatics hooks
- Add audio session teardown on stop for proper cleanup
- Implement agent audio recording with sendAgentAudio in AgentInputArea
- Fix Android navigation race condition in CreateAgentModal (navigate before closing)
- Add animations to global footer and agent screen (FadeIn/FadeOut)
- Auto-cancel stuck agents when sending new messages
- Fix permission request ID propagation from AgentManager to Session
- Apply theme background color via AppContainer wrapper

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

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

packages/app/src/components/create-agent-modal.tsx

@@ -131,10 +131,14 @@ export function CreateAgentModal({
         console.log("[CreateAgentModal] Agent created:", agentId);
         setIsLoading(false);
         setPendingRequestId(null);
-        handleClose();
 
-        // Navigate to the agent page
+        // Navigate to the agent page BEFORE closing modal
+        // This prevents race condition on Android where router.push() happens
+        // while the modal is unmounting, causing NullPointerException
         router.push(`/agent/${agentId}`);
+
+        // Close modal after navigation starts
+        handleClose();
       }
     });