refactor(web): unify settings panel layouts with shared toolbar/body

- Add PanelToolbar/PanelBody primitives so all four settings tabs share
  the same top-toolbar + scrollable-body rhythm under the unified header.
- API panel: drop the heavy gray shadowed TabsList; move the create
  action into the toolbar next to the tabs, lighten per-tab hints.
- Storage panel: reuse PanelToolbar for the generated-at/refresh bar.
- Account panel: wrap content in PanelBody for consistent padding.
- Models panel: keep the pinned LangBot Models (Space) card at the very
  top, above the add-custom-provider row (intentional pin), using
  PanelBody instead of a top toolbar.

web/src/app/home/plugins/components/plugin-installed/PluginCardVO.ts

@@ -9,7 +9,7 @@ export interface IPluginCardVO {
   enabled: boolean;
   priority: number;
   install_source: string;
-  install_info: Record<string, any>; // eslint-disable-line @typescript-eslint/no-explicit-any
+  install_info: Record<string, any>;
   status: string;
   components: PluginComponent[];
   debug: boolean;
@@ -27,7 +27,7 @@ export class PluginCardVO implements IPluginCardVO {
   priority: number;
   debug: boolean;
   install_source: string;
-  install_info: Record<string, any>; // eslint-disable-line @typescript-eslint/no-explicit-any
+  install_info: Record<string, any>;
   status: string;
   components: PluginComponent[];
   hasUpdate?: boolean;