Full Asset Selection Experience (Assets API) (#5900)

## Summary

Full Integration of Asset Browsing and Selection when Assets API is
enabled.

## Changes

1. Replace Model Left Side Tab with experience
2. Configurable titles for the Asset Browser Modal
3. Refactors to simplify callback code
4. Refactor to make modal filters reactive (they change their values
based on assets displayed)
5. Add `browse()` mode with ability to create node directly from the
Asset Browser Modal (in `browse()` mode)

## Screenshots

Demo of many different types of Nodes getting configured by the Modal



https://github.com/user-attachments/assets/34f9c964-cdf2-4c5d-86a9-a8e7126a7de9

┆Issue is synchronized with this [Notion
page](https://www.notion.so/PR-5900-Feat-asset-selection-cloud-integration-2816d73d365081ccb4aeecdc14b0e5d3)
by [Unito](https://www.unito.io)

src/components/widget/layout/BaseModalLayout.vue

@@ -48,7 +48,10 @@
           <main class="flex flex-col flex-1 min-h-0">
             <!-- Fallback title bar when no leftPanel is provided -->
             <slot name="contentFilter"></slot>
-            <h2 v-if="!$slots.leftPanel" class="text-xxl px-6 pt-2 pb-6 m-0">
+            <h2
+              v-if="!$slots.leftPanel"
+              class="text-xxl px-6 pt-2 pb-6 m-0 capitalize"
+            >
               {{ contentTitle }}
             </h2>
             <div :class="contentContainerClasses">