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/components/breadcrumb/SubgraphBreadcrumbItem.vue

@@ -6,7 +6,7 @@
       showDelay: 512
     }"
     href="#"
-    class="p-breadcrumb-item-link cursor-pointer"
+    class="p-breadcrumb-item-link h-12 cursor-pointer px-2"
     :class="{
       'flex items-center gap-1': isActive,
       'p-breadcrumb-item-link-menu-visible': menu?.overlayVisible,
@@ -15,7 +15,7 @@
     }"
     @click="handleClick"
   >
-    <span class="p-breadcrumb-item-label">{{ item.label }}</span>
+    <span class="p-breadcrumb-item-label px-2">{{ item.label }}</span>
     <Tag v-if="item.isBlueprint" :value="'Blueprint'" severity="primary" />
     <i v-if="isActive" class="pi pi-angle-down text-[10px]"></i>
   </a>
@@ -26,7 +26,7 @@
     :popup="true"
     :pt="{
       root: {
-        style: 'background-color: var(--comfy-menu-secondary-bg)'
+        style: 'background-color: var(--comfy-menu-bg)'
       },
       itemLink: {
         class: 'py-2'
@@ -240,7 +240,6 @@ const inputBlur = async (doRename: boolean) => {
 
 .p-breadcrumb-item-link {
   @apply overflow-hidden;
-  padding: var(--p-breadcrumb-item-padding);
 }
 
 .p-breadcrumb-item-label {