feat: add animation progress bar for 3D nodes and viewer (#7839)

## Summary
- Add draggable progress bar to AnimationControls component
- Display current time / total duration
- Allow seeking through animations when paused or playing
- Add animation controls to 3D Viewer

fix https://github.com/Comfy-Org/ComfyUI_frontend/issues/7830 and
https://github.com/Comfy-Org/ComfyUI_frontend/issues/7831

## Screenshots (if applicable)


https://github.com/user-attachments/assets/f6d0668c-c7a4-497e-8345-9ef6e47a41c6

┆Issue is synchronized with this [Notion
page](https://www.notion.so/PR-7839-feat-add-animation-progress-bar-for-3D-nodes-and-viewer-2de6d73d36508101ac98f673206b30d9)
by [Unito](https://www.unito.io)

src/components/load3d/Load3D.vue

@@ -33,6 +33,9 @@
         v-model:playing="playing"
         v-model:selected-speed="selectedSpeed"
         v-model:selected-animation="selectedAnimation"
+        v-model:animation-progress="animationProgress"
+        v-model:animation-duration="animationDuration"
+        @seek="handleSeek"
       />
     </div>
     <div
@@ -119,6 +122,8 @@ const {
   playing,
   selectedSpeed,
   selectedAnimation,
+  animationProgress,
+  animationDuration,
   loading,
   loadingMessage,
 
@@ -130,6 +135,7 @@ const {
   handleStopRecording,
   handleExportRecording,
   handleClearRecording,
+  handleSeek,
   handleBackgroundImageUpdate,
   handleExportModel,
   handleModelDrop,

src/components/load3d/Load3dViewerContent.vue

@@ -15,6 +15,16 @@
         @dragleave.stop="handleDragLeave"
         @drop.prevent.stop="handleDrop"
       />
+      <AnimationControls
+        v-if="viewer.animations.value && viewer.animations.value.length > 0"
+        v-model:animations="viewer.animations.value"
+        v-model:playing="viewer.playing.value"
+        v-model:selected-speed="viewer.selectedSpeed.value"
+        v-model:selected-animation="viewer.selectedAnimation.value"
+        v-model:animation-progress="viewer.animationProgress.value"
+        v-model:animation-duration="viewer.animationDuration.value"
+        @seek="viewer.handleSeek"
+      />
       <div
         v-if="isDragging"
         class="pointer-events-none absolute inset-0 z-50 flex items-center justify-center bg-black/60 backdrop-blur-sm"
@@ -85,6 +95,7 @@
 <script setup lang="ts">
 import { onBeforeUnmount, onMounted, ref, toRaw } from 'vue'
 
+import AnimationControls from '@/components/load3d/controls/AnimationControls.vue'
 import CameraControls from '@/components/load3d/controls/viewer/ViewerCameraControls.vue'
 import ExportControls from '@/components/load3d/controls/viewer/ViewerExportControls.vue'
 import LightControls from '@/components/load3d/controls/viewer/ViewerLightControls.vue'

src/components/load3d/controls/AnimationControls.vue

@@ -1,42 +1,64 @@
 <template>
   <div
     v-if="animations && animations.length > 0"
-    class="pointer-events-auto absolute top-0 left-0 z-10 flex w-full items-center justify-center gap-2 pt-2"
+    class="pointer-events-auto absolute top-0 left-0 z-10 flex w-full flex-col items-center gap-2 pt-2"
   >
-    <Button
-      size="icon"
-      variant="textonly"
-      class="rounded-full"
-      :aria-label="$t('g.playPause')"
-      @click="togglePlay"
-    >
-      <i
-        :class="['pi', playing ? 'pi-pause' : 'pi-play', 'text-lg text-white']"
+    <div class="flex items-center justify-center gap-2">
+      <Button
+        size="icon"
+        variant="textonly"
+        class="rounded-full"
+        :aria-label="$t('g.playPause')"
+        @click="togglePlay"
+      >
+        <i
+          :class="[
+            'pi',
+            playing ? 'pi-pause' : 'pi-play',
+            'text-lg text-white'
+          ]"
+        />
+      </Button>
+
+      <Select
+        v-model="selectedSpeed"
+        :options="speedOptions"
+        option-label="name"
+        option-value="value"
+        class="w-24"
       />
-    </Button>
 
-    <Select
-      v-model="selectedSpeed"
-      :options="speedOptions"
-      option-label="name"
-      option-value="value"
-      class="w-24"
-    />
+      <Select
+        v-model="selectedAnimation"
+        :options="animations"
+        option-label="name"
+        option-value="index"
+        class="w-32"
+      />
+    </div>
 
-    <Select
-      v-model="selectedAnimation"
-      :options="animations"
-      option-label="name"
-      option-value="index"
-      class="w-32"
-    />
+    <div class="flex w-full max-w-xs items-center gap-2 px-4">
+      <Slider
+        :model-value="[animationProgress]"
+        :min="0"
+        :max="100"
+        :step="0.1"
+        class="flex-1"
+        @update:model-value="handleSliderChange"
+      />
+      <span class="min-w-16 text-xs text-white">
+        {{ formatTime(currentTime) }} / {{ formatTime(animationDuration) }}
+      </span>
+    </div>
   </div>
 </template>
 
 <script setup lang="ts">
 import Select from 'primevue/select'
+import { computed } from 'vue'
 
 import Button from '@/components/ui/button/Button.vue'
+import Slider from '@/components/ui/slider/Slider.vue'
 
 type Animation = { name: string; index: number }
 
@@ -44,6 +66,16 @@ const animations = defineModel<Animation[]>('animations')
 const playing = defineModel<boolean>('playing')
 const selectedSpeed = defineModel<number>('selectedSpeed')
 const selectedAnimation = defineModel<number>('selectedAnimation')
+const animationProgress = defineModel<number>('animationProgress', {
+  default: 0
+})
+const animationDuration = defineModel<number>('animationDuration', {
+  default: 0
+})
+
+const emit = defineEmits<{
+  seek: [progress: number]
+}>()
 
 const speedOptions = [
   { name: '0.1x', value: 0.1 },
@@ -53,7 +85,25 @@ const speedOptions = [
   { name: '2x', value: 2 }
 ]
 
-const togglePlay = () => {
+const currentTime = computed(() => {
+  if (!animationDuration.value) return 0
+  return (animationProgress.value / 100) * animationDuration.value
+})
+
+function formatTime(seconds: number): string {
+  const mins = Math.floor(seconds / 60)
+  const secs = (seconds % 60).toFixed(1)
+  return mins > 0 ? `${mins}:${secs.padStart(4, '0')}` : `${secs}s`
+}
+
+function togglePlay() {
   playing.value = !playing.value
 }
+
+function handleSliderChange(value: number[] | undefined) {
+  if (!value) return
+  const progress = value[0]
+  animationProgress.value = progress
+  emit('seek', progress)
+}
 </script>