Refactor scrolling methods in ScrollState to accept an amount parameter

- Updated `scroll_up` and `scroll_down` methods to take an `amount` parameter for more flexible scrolling.
- Removed the `AgentMode` enum and related methods from the types module to simplify state management.
- Modified `AppStateRest` to remove the `mode` field and adjusted related logic.
- Enhanced `run_subagent` to build tool definitions and handle API key resolution from configuration.
- Updated command parsing to reflect changes in login handling.
- Removed onboarding overlays and related logic from input handling and rendering.
- Improved status bar to reflect connection status and agent readiness.
- Adjusted workflow panel rendering to simplify phase status display.
- Refactored edit log initialization to load from disk if available.
- Updated settings structure to use a HashMap for API keys.
- Enhanced error handling in LlmClient for authentication issues.

src/app/mode/mod.rs

@@ -5,8 +5,7 @@ pub mod editor;
 pub mod effort;
 pub mod key_input;
 pub mod mcp;
-pub mod onboard;
-pub mod onboard_provider;
+
 pub mod quit_confirm;
 pub mod rewind;
 pub mod security;
@@ -22,8 +21,7 @@ pub enum ModeKind {
     Help,
     Settings,
     QuitConfirm,
-    Onboard,
-    OnboardProvider,
+
     KeyInput,
     Editor,
     Effort,