Configurable location for OpenCode: sidebar or main window

openspec/changes/archive/add-default-view-location/tasks.md

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+## 1. Implementation
+
+- [ ] 1.1 Add `defaultViewLocation` type and setting to `src/types.ts`
+  - Add type: `"sidebar" | "main"`
+  - Add to `OpenCodeSettings` interface
+  - Add default value `"sidebar"` to `DEFAULT_SETTINGS`
+
+- [ ] 1.2 Update `src/main.ts` view activation logic
+  - Modify `activateView()` method to check `defaultViewLocation` setting
+  - For "sidebar": use `getLeaf("right")` (existing behavior)
+  - For "main": use `getLeaf("tab")` to open in main editor area
+  - Ensure existing view detection works for both locations
+
+- [ ] 1.3 Add setting UI to `src/SettingsTab.ts`
+  - Add dropdown setting for "Default view location"
+  - Options: "Sidebar" and "Main window"
+  - Description explaining the behavior difference
+
+- [ ] 1.4 Test the feature
+  - Verify sidebar mode opens in right sidebar
+  - Verify main mode opens as a tab in editor area
+  - Verify toggling reveals existing view regardless of location
+  - Verify setting persists across plugin reload