docs(models): sync WorkspaceProfile dataclass to 4-field model

Match the actual src/models.py WorkspaceProfile:
- name: str
- ini_content: str
- show_windows: Dict[str, bool]
- panel_states: Dict[str, Any]

Remove fictional fields (scope, auto_switch_triggers, description).
Remove non-existent LayoutPreset class (was a 2026-06-05 casualty).

docs/guide_models.md

@@ -315,26 +315,18 @@ class HookResponse:
     data: dict[str, Any] = field(default_factory=dict)
 ```
 
-### `WorkspaceProfile`, `LayoutPreset` — Layouts
+### `WorkspaceProfile` — Layouts
 
 ```python
-@dataclass
 class WorkspaceProfile:
     name: str
-    scope: Literal["global", "project"]
-    docking_layout: str  # ImGui ini-string
-    window_visibility: dict[str, bool] = field(default_factory=dict)
-    panel_state: dict[str, dict] = field(default_factory=dict)
-    auto_switch_triggers: list[str] = field(default_factory=list)
-    description: str = ""
-
-@dataclass
-class LayoutPreset:
-    name: str
-    multi_viewport_state: dict[str, Any] = field(default_factory=dict)
-    description: str = ""
+    ini_content: str                                 # ImGui ini settings string (from SaveIniSettingsToMemory)
+    show_windows: Dict[str, bool] = field(default_factory=dict)
+    panel_states: Dict[str, Any] = field(default_factory=dict)
 ```
 
+> **Note:** The 2026-06-05 refactor (per `live_gui_fragility_fixes_20260605`) collapsed the previous design (which had `docking_layout: bytes` with base64, plus `theme`, `theme_fx_enabled`, `captured_at`, `description` as additional fields) into a 4-field model. `ini_content` is a plain `str` (not base64) because `ImGui.SaveIniSettingsToMemory()` returns a string and `tomli_w` rejects `bytes`. `LayoutPreset` is no longer a separate class; multi-viewport state lives in `panel_states`. See [guide_workspace_profiles.md](guide_workspace_profiles.md) for the full data model and TOML example.
+
 ### `RAGConfig`, `RAGChunk`, `RAGResult` — RAG
 
 ```python