feat(ui): implement compact tool output and structured tool results

This commit introduces the compactToolOutput feature to optimize terminal vertical space usage for common, high-volume tools.

1. Compact Tool Output UI:
- Added DenseToolMessage component for rendering compact, single-line tool summaries.
- Updated ToolGroupMessage to detect contiguous compact tools and render them with stitched borders for a streamlined look.
- Added Ctrl+O shortcut in AppContainer to toggle full expansion of tool results from the last turn.
- Implemented useGeminiStream border logic to correctly render borders around dense sections.

2. Core Tool Structured Results:
- grep: Updated to return GrepResult with matches, file paths, and line numbers instead of a raw formatted string.
- ls (list_directory): Updated to return ListDirectoryResult with an array of files.
- read_many_files: Updated to return ReadManyFilesResult with read files, skipped files, and reasons.
- Modified ToolResultDisplay and isStructuredToolResult type guards to support these new structured interfaces.

3. User Settings & Documentation:
- Added compactToolOutput to the UI settings schema (default: true).
- Updated configuration docs and schema to reflect the new setting.
- Adjusted compact subview line limits (COMPACT_TOOL_SUBVIEW_MAX_LINES).

docs/reference/configuration.md

@@ -256,6 +256,11 @@ their corresponding top-level category object in your `settings.json` file.
   - **Description:** Show the "? for shortcuts" hint above the input.
   - **Default:** `true`
 
+- **`ui.compactToolOutput`** (boolean):
+  - **Description:** Display tool outputs (like directory listings and file
+    reads) in a compact, structured format.
+  - **Default:** `false`
+
 - **`ui.hideBanner`** (boolean):
   - **Description:** Hide the application banner
   - **Default:** `false`
@@ -2299,7 +2304,7 @@ conventions and context.
     loaded, allowing you to verify the hierarchy and content being used by the
     AI.
   - See the [Commands documentation](./commands.md#memory) for full details on
-    the `/memory` command and its sub-commands (`show` and `reload`).
+    the `/memory` command and its sub-commands (`show` and `refresh`).
 
 By understanding and utilizing these configuration layers and the hierarchical
 nature of context files, you can effectively manage the AI's memory and tailor