feat(cli): decouple history filtering from tool output layout

- Introduce 'ui.enableCompactToolOutput' (default: true) to control tool output layout.
- Separated the overloaded 'output.verbosity' setting into two distinct concerns: 'output.verbosity' now strictly filters history content, while 'ui.enableCompactToolOutput' toggles between dense and boxed layouts.
- Update useGeminiStream and ToolGroupMessage to respect the new architectural separation.

schemas/settings.schema.json

@@ -359,6 +359,13 @@
           "default": true,
           "type": "boolean"
         },
+        "enableCompactToolOutput": {
+          "title": "Enable Compact Tool Output",
+          "description": "Render tool outputs in a compact, single-line format when possible.",
+          "markdownDescription": "Render tool outputs in a compact, single-line format when possible.\n\n- Category: `UI`\n- Requires restart: `no`\n- Default: `true`",
+          "default": true,
+          "type": "boolean"
+        },
         "customWittyPhrases": {
           "title": "Custom Witty Phrases",
           "description": "Custom witty phrases to display during loading. When provided, the CLI cycles through these instead of the defaults.",