feat/fix: App mode QA updates (#9439)

## Summary

Various fixes from app mode QA

## Changes

- **What**: 
- fix: prevent inserting nodes from workflow/apps sidebar tabs
- fix: hide json extension in workflow tab
- fix: hide apps nav button in apps tab when already in apps mode
- fix: center text on arrange page
- fix: prevent IoItems from "jumping" due to stale transform after drag
and drop op
- fix: refactor side panels and add custom stable pixel based sizing
- fix: make outputs/inputs lists in app builder scrollable
- fix: fix rerun not working correctly

- feat: add text to interrupt button
- feat: add enter app mode button to builder toolbar
- feat: add tooltip to download button on linear view
- feat: show last output of workflow in arrange tab if available
- feat: show download count in download all button, hide if only 1 asset
to download

## Review Focus

- Rerun - I am not sure why it was triggering widget actions, removing
it seemed like the correct fix
- useStablePrimeVueSplitter - this is a workaround for the fact it uses
percent sizing, I also tried switching to reka-ui splitters, but they
also only support % sizing in our version [pixel based looks to have
been added in a newer version, will log an issue to upgrade & replace
splitters with this]


## Screenshots (if applicable)

<img width="1314" height="1129" alt="image"
src="https://github.com/user-attachments/assets/c430f9d6-7c29-4853-803e-5b6fe7086fca"
/>
<img width="511" height="283" alt="image"
src="https://github.com/user-attachments/assets/b7e594d4-70a1-41e3-8ba1-78512f2a5c8b"
/>
<img width="254" height="232" alt="image"
src="https://github.com/user-attachments/assets/1d146399-39ea-4b0e-928c-340b74957535"
/>
<img width="487" height="198" alt="image"
src="https://github.com/user-attachments/assets/e2ba7f5d-8ff5-47f4-9526-61ebb99514b8"
/>
<img width="378" height="647" alt="image"
src="https://github.com/user-attachments/assets/a47a3054-9320-4327-bdc0-b0a16e19f83d"
/>
<img width="1016" height="476" alt="image"
src="https://github.com/user-attachments/assets/479ae50e-d380-4d56-a5c9-5df142b14ed0"
/>


┆Issue is synchronized with this [Notion
page](https://www.notion.so/PR-9439-feat-fix-App-mode-QA-updates-31a6d73d365081b38337d63207b88817)
by [Unito](https://www.unito.io)

src/scripts/ui/draggableList.ts

@@ -314,18 +314,22 @@ export class DraggableList extends EventTarget {
   unsetDraggableItem() {
     this.draggableItem.style = null
     this.draggableItem.classList.remove('is-draggable')
-    this.draggableItem.classList.add('is-idle')
     this.draggableItem = null
   }
 
   unsetItemState() {
-    this.getIdleItems().forEach((item) => {
-      // @ts-expect-error fixme ts strict error
+    this.getIdleItems().forEach((item: HTMLElement) => {
       delete item.dataset.isAbove
-      // @ts-expect-error fixme ts strict error
       delete item.dataset.isToggled
-      // @ts-expect-error fixme ts strict error
       item.style.transform = ''
+
+      // Defer re-adding is-idle (which enables CSS transitions) until after
+      // the browser paints items in their final positions. Without this,
+      // the transition animates the stale drag transform.
+      item.classList.remove('is-idle')
+      requestAnimationFrame(() => {
+        item.classList.add('is-idle')
+      })
     })
   }