[FL-2705] App RPC Bug Fixes and redesign

[skotopes]

What's new

• FL-2705 App RPC Bug Fixes and redesign

Verification

• Compile and upload
• Test App RPC

Checklist (For Reviewer)

• [ ] PR has description of feature/bug or link to Confluence/Jira task
• [ ] Description contains actions to verify feature/bugfix
• [ ] I've built this code, uploaded it to the device and verified feature/bugfix

[github-actions[bot]]

Compiled firmware for commit 172833f9:

• 📦 Update package
• 📥 DFU file
• ☁️ Web updater