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/model/settings.rs

@@ -29,7 +29,7 @@ pub struct Settings {
     pub internet_mode: InternetMode,
     pub provider: String,
     pub model: String,
-    pub api_key: Option<String>,
+    pub api_keys: std::collections::HashMap<String, String>,
     pub max_tokens: u32,
     pub temperature: f32,
     pub review_enabled: bool,
@@ -47,7 +47,7 @@ impl Default for Settings {
             internet_mode: InternetMode::Off,
             provider: "zen".to_string(),
             model: "deepseek-v4-flash-free".to_string(),
-            api_key: None,
+            api_keys: std::collections::HashMap::new(),
             max_tokens: 8192,
             temperature: 0.7,
             review_enabled: true,