Floating Menus - UI rework (#5980)

## Summary

Enhancing and further modernizing the UI, giving users more usable area
whilst keeping farmiliar positioning and feel of elements.

## Changes

- **What**: Significant restructure of the UI elements, changing
elements from large blocks to floating elements, updating:
- Side toolbar menu (floating style, supports small/normal mode,
combines to scroll on height overflow)
- Bottom tabs panel (floating style, tabs redesigned)
- Action bar (support for docking/undocking menu)
    - Added login/user menu button to top right
- Restyled breadcrumbs (still collapse when overflows)
- Add litegraph support for fps info position (so it isn't covered by
the sidebar)

- **Breaking**: 
- Removed various elements and added new ones, I have tested custom
sidebars, custom actions, etc but if scripts are inserting elements into
"other" elements they may have been (re)moved.
- Remove support for bottom menu
- Remove support for 2nd-row tabs

## Screenshots 
<img width="1116" height="907" alt="ui"
src="https://github.com/user-attachments/assets/b040a215-67d3-4c88-8c4d-f402a16a34f6"
/>


https://github.com/user-attachments/assets/571dbda5-01ec-47e8-b235-ee1b88c93dd0

┆Issue is synchronized with this [Notion
page](https://www.notion.so/PR-5980-Floating-Menus-UI-rework-2866d73d3650810aac60cc1afe979b60)
by [Unito](https://www.unito.io)

---------

Co-authored-by: GitHub Action <action@github.com>
Co-authored-by: github-actions <github-actions@github.com>

src/platform/settings/constants/coreSettings.ts

@@ -115,6 +115,14 @@ export const CORE_SETTINGS: SettingParams[] = [
     defaultValue: true,
     versionAdded: '1.18.1'
   },
+  {
+    id: 'Comfy.Sidebar.Style',
+    category: ['Appearance', 'Sidebar', 'Style'],
+    name: 'Sidebar style',
+    type: 'combo',
+    options: ['floating', 'connected'],
+    defaultValue: 'floating'
+  },
   {
     id: 'Comfy.TextareaWidget.FontSize',
     category: ['Appearance', 'Node Widget', 'TextareaWidget', 'FontSize'],
@@ -549,13 +557,15 @@ export const CORE_SETTINGS: SettingParams[] = [
     defaultValue: 'Top',
     name: 'Use new menu',
     type: 'combo',
-    options: ['Disabled', 'Top', 'Bottom'],
+    options: ['Disabled', 'Top'],
     tooltip:
       'Menu bar position. On mobile devices, the menu is always shown at the top.',
     migrateDeprecatedValue: (value: string) => {
       // Floating is now supported by dragging the docked actionbar off.
       if (value === 'Floating') {
         return 'Top'
+      } else if (value === 'Bottom') {
+        return 'Top'
       }
       return value
     }
@@ -564,10 +574,14 @@ export const CORE_SETTINGS: SettingParams[] = [
     id: 'Comfy.Workflow.WorkflowTabsPosition',
     name: 'Opened workflows position',
     type: 'combo',
-    options: ['Sidebar', 'Topbar', 'Topbar (2nd-row)'],
-    // Default to topbar (2nd-row) if the window is less than 1536px(2xl) wide.
-    defaultValue: () =>
-      window.innerWidth < 1536 ? 'Topbar (2nd-row)' : 'Topbar'
+    options: ['Sidebar', 'Topbar'],
+    defaultValue: 'Topbar',
+    migrateDeprecatedValue: (value: string) => {
+      if (value === 'Topbar (2nd-row)') {
+        return 'Topbar'
+      }
+      return value
+    }
   },
   {
     id: 'Comfy.Graph.CanvasMenu',