[Bug] Service Required screen: Load failed and buttons disabled on app startup #129

Summary

On app startup, the "OpenHuman Service Required" screen shows "Load failed" and all action buttons (Install, Start, Stop, Restart, Uninstall) are disabled — the user is stuck with no way to recover.

Problem

What happened: App launches to the Service Required gate screen. It attempts to connect to the core daemon at http://127.0.0.1:7788/rpc and fails. A red "Load failed" banner appears. All buttons except Refresh are grayed out and unclickable.

What was expected: The Install Service and Start Service buttons should be usable so the user can bootstrap the daemon from this screen.

Impact: Blocks the entire app — user cannot get past this screen.

Steps to reproduce:

1. Fresh install of the app (or core daemon not running)
2. Launch the app
3. "OpenHuman Service Required" screen appears
4. Service: Unknown, Agent Server: Not Running, "Load failed" in red
5. All buttons disabled except Refresh

Platform: macOS (desktop)

Solution

Root cause: Catch-22 in ServiceBlockingGate.tsx. When the RPC health check fails:

1. Service state is set to "Unknown"
2. The button disable logic derives installed = (serviceStateText !== 'NotInstalled') — but "Unknown" doesn't match any known state, so installed resolves to false in practice
3. Most buttons require installed === true to be enabled (Install requires !installed, but it also requires the RPC to succeed to execute)
4. The buttons that should help recover (Install, Start) are disabled by the very state they need to fix

Proposed fix:

1. Enable Install and Start buttons when state is "Unknown" — these are the recovery actions and should always be clickable
2. Clear error banner on retry — currently the error persists even if the user clicks Refresh
3. Route Install/Start through Tauri commands directly instead of RPC when the daemon isn't reachable — the RPC server is the daemon itself, so you can't ask it to install/start itself if it's not running

Key files:

• app/src/components/daemon/ServiceBlockingGate.tsx — gate component with button disable logic
• app/src/services/coreRpcClient.ts — RPC client hitting :7788
• app/src-tauri/src/core_process.rs — core process management
• src/openhuman/service/macos.rs — macOS LaunchAgent install/start
• src/openhuman/service/common.rs — daemon executable resolution

Acceptance criteria

• Install Service and Start Service buttons are enabled when service state is Unknown or Load failed
• Error banner clears when user retries or clicks a button
• Service can be installed and started from the blocked screen without the daemon already running
• Repro gone — fresh install shows working buttons on the Service Required screen
• Regression safety — existing service management flows still work when daemon is already running

Related

Priority: High — blocks app startup for new users.