linear v2: Simple Mode (#7734)

A major, full rewrite of linear mode, now under the name "Simple Mode". 
- Fixes widget styling
- Adds a new simplified history
- Adds support for non-image outputs
- Supports right sidebar
- Allows and panning on the output image preview
- Provides support for drag and drop zones
- Moves workflow notes into a popover.
- Allows scrolling through outputs with Ctrl+scroll or arrow keys

The primary means of accessing Simple Mode is a toggle button on the
bottom right. This button is only shown if a feature flag is enabled, or
the user has already seen linear mode during the current session. Simple
Mode can also be accessed by
- Using the toggle linear mode keybind
- Loading a workflow that that was saved in Simple Mode workflow
- Loading a template url with appropriate parameter

<img width="1790" height="1387" alt="image"
src="https://github.com/user-attachments/assets/d86a4a41-dfbf-41e7-a6d9-146473005606"
/>

Known issues:
- Outputs on cloud are not filtered to those produced by the current
workflow.
  - Output filtering has been globally disabled for consistency
- Outputs will load more items on scroll, but does not unload
- Performance may be reduced on weak devices with very large histories.

┆Issue is synchronized with this [Notion
page](https://www.notion.so/PR-7734-linear-v2-2d16d73d3650819b8a10f150ff12ea22)
by [Unito](https://www.unito.io)

src/components/ui/ZoomPane.vue

@@ -0,0 +1,59 @@
+<script setup lang="ts">
+import { computed, ref, useTemplateRef } from 'vue'
+
+const zoomPane = useTemplateRef('zoomPane')
+
+const zoom = ref(1.0)
+const panX = ref(0.0)
+const panY = ref(0.0)
+
+function handleWheel(e: WheelEvent) {
+  const zoomPaneEl = zoomPane.value
+  if (!zoomPaneEl) return
+
+  zoom.value -= e.deltaY
+  const { x, y, width, height } = zoomPaneEl.getBoundingClientRect()
+  const offsetX = e.clientX - x - width / 2
+  const offsetY = e.clientY - y - height / 2
+  const scaler = 1.1 ** (e.deltaY / -30)
+
+  panY.value = panY.value * scaler - offsetY * (scaler - 1)
+  panX.value = panX.value * scaler - offsetX * (scaler - 1)
+}
+
+let dragging = false
+function handleDown(e: PointerEvent) {
+  if (e.button !== 0) return
+
+  const zoomPaneEl = zoomPane.value
+  if (!zoomPaneEl) return
+  zoomPaneEl.parentElement?.focus()
+
+  zoomPaneEl.setPointerCapture(e.pointerId)
+  dragging = true
+}
+function handleMove(e: PointerEvent) {
+  if (!dragging) return
+  panX.value += e.movementX
+  panY.value += e.movementY
+}
+
+const transform = computed(() => {
+  const scale = 1.1 ** (zoom.value / 30)
+  const matrix = [scale, 0, 0, scale, panX.value, panY.value]
+  return `matrix(${matrix.join(',')})`
+})
+</script>
+<template>
+  <div
+    ref="zoomPane"
+    class="contain-size flex place-content-center"
+    @wheel="handleWheel"
+    @pointerdown.prevent="handleDown"
+    @pointermove="handleMove"
+    @pointerup="dragging = false"
+    @pointercancel="dragging = false"
+  >
+    <slot :style="{ transform }" />
+  </div>
+</template>