Release v1.01 Enhanced: Vi Control, TUI Gen5, Core Stability

Documentation/implementation_plan_nextgen.md

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+# Next-Gen TUI Implementation Plan
+
+## Goal
+Transform the TUI into a "Tactile" IDE by adding interactive file exploration (Context Matrix) and safe code application (Rich Diff Review).
+
+## User Review Required
+> [!IMPORTANT]
+> **New Dependencies**: We need to add `diff` package for the diff view.
+> **Navigation Change**: `Tab` key will now toggle focus between Chat Input and Sidebar. This changes existing behavior (previously Tab toggled Sidebar visibility in narrow mode).
+
+## Proposed Changes
+
+### 1. New Component: `FileTree.mjs`
+- **Location**: `bin/ui/components/FileTree.mjs`
+- **Functionality**:
+  - Recursive directory walker.
+  - State: `expandedFolders` (Set), `selectedFiles` (Set).
+  - UI:
+    - `▼ folder/`
+    - `  [x] file.js`
+  - Interaction:
+    - `Up/Down`: Navigate.
+    - `Right/Enter`: Expand folder.
+    - `Left`: Collapse folder.
+    - `Space`: Toggle selection (Add/Remove from Context).
+
+### 2. Updated Sidebar
+- **File**: `bin/opencode-ink.mjs`
+- **Change**: Render `FileTree` inside Sidebar when focused.
+- **State**: Track `sidebarFocus` boolean.
+
+### 3. New Component: `DiffView.mjs`
+- **Location**: `bin/ui/components/DiffView.mjs`
+- **Functionality**:
+  - Input: `originalContent`, `newContent`.
+  - Output: Visual diff (Green lines for additions, Red for deletions).
+  - Interactive Footer: `[ Apply ]  [ Reject ]`.
+
+### 4. Integration Logic
+- **File**: `bin/opencode-ink.mjs`
+- **Change**:
+  - Intercept `/write` command or "CREATE:" blocks.
+  - Instead of writing immediately, store in `pendingDiff`.
+  - Render `DiffView` overlay.
+  - Wait for user `Apply` signal.
+
+## Verification Plan
+
+### Manual Verification
+1. **Navigation**:
+   - Run TUI. Press `Tab` to focus Sidebar.
+   - Use Arrow keys. Ensure cursor moves.
+   - Expand `bin/`. See files.
+
+2. **Context Selection**:
+   - Navigate to `package.json`. Press `Space`.
+   - Verify visually (Green checkmark).
+   - Send message "What is in the selected file?". Verify AI sees it.
+
+3. **Diff Review**:
+   - Ask AI "Refactor the file header".
+   - AI outputs code.
+   - **Expected**: Diff View appears showing changes.
+   - Select `Apply`.
+   - Verify file is written.