feat: add Show Tutorial button, temporarily disable NetworkGraphPanel

- Add "Show Tutorial" button to mobile menu to trigger onboarding tour
- Comment out NetworkGraphPanel for main branch (code preserved)
- Add class name to CryptID dropdown for tour targeting

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

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

src/ui/components.tsx

@@ -1660,7 +1660,8 @@ function CustomInFrontOfCanvas() {
       <MycelialIntelligenceBar />
       <FocusLockIndicator />
       <CommandPalette />
-      <NetworkGraphPanel />
+      {/* NetworkGraphPanel temporarily disabled for main branch - re-enable when ready */}
+      {/* <NetworkGraphPanel /> */}
       <OnboardingTour />
     </>
   )