phase 6

ui/framework/src/renderers/FrameRenderer.vue

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+<script setup lang="ts">
+import { ref, watch, onMounted, onUnmounted, nextTick } from 'vue'
+
+export interface FrameBBox {
+  x: number
+  y: number
+  w: number
+  h: number
+  confidence: number
+  label: string
+}
+
+const props = defineProps<{
+  /** Base64 JPEG image */
+  imageSrc: string
+  /** Bounding boxes to overlay */
+  boxes: FrameBBox[]
+}>()
+
+const canvas = ref<HTMLCanvasElement | null>(null)
+const container = ref<HTMLElement | null>(null)
+
+function draw() {
+  const cvs = canvas.value
+  const ctr = container.value
+  if (!cvs || !ctr || !props.imageSrc) return
+
+  const ctx = cvs.getContext('2d')
+  if (!ctx) return
+
+  const img = new window.Image()
+  img.onload = () => {
+    cvs.width = ctr.clientWidth
+    cvs.height = ctr.clientHeight
+
+    const scale = Math.min(cvs.width / img.width, cvs.height / img.height)
+    const dx = (cvs.width - img.width * scale) / 2
+    const dy = (cvs.height - img.height * scale) / 2
+
+    ctx.clearRect(0, 0, cvs.width, cvs.height)
+    ctx.drawImage(img, dx, dy, img.width * scale, img.height * scale)
+
+    for (const box of props.boxes) {
+      const bx = dx + box.x * scale
+      const by = dy + box.y * scale
+      const bw = box.w * scale
+      const bh = box.h * scale
+
+      // Box outline
+      ctx.strokeStyle = confidenceColor(box.confidence)
+      ctx.lineWidth = 2
+      ctx.strokeRect(bx, by, bw, bh)
+
+      // Label background
+      const label = `${box.label} ${(box.confidence * 100).toFixed(0)}%`
+      ctx.font = '11px var(--font-mono)'
+      const metrics = ctx.measureText(label)
+      const labelH = 16
+      ctx.fillStyle = confidenceColor(box.confidence)
+      ctx.fillRect(bx, by - labelH, metrics.width + 8, labelH)
+
+      // Label text
+      ctx.fillStyle = '#000'
+      ctx.fillText(label, bx + 4, by - 4)
+    }
+  }
+  img.src = `data:image/jpeg;base64,${props.imageSrc}`
+}
+
+function confidenceColor(conf: number): string {
+  if (conf >= 0.7) return 'var(--conf-high)'
+  if (conf >= 0.4) return 'var(--conf-mid)'
+  return 'var(--conf-low)'
+}
+
+watch(() => [props.imageSrc, props.boxes], () => nextTick(draw), { deep: true })
+
+onMounted(() => {
+  nextTick(draw)
+  const observer = new ResizeObserver(() => draw())
+  if (container.value) observer.observe(container.value)
+  onUnmounted(() => observer.disconnect())
+})
+</script>
+
+<template>
+  <div ref="container" class="frame-renderer">
+    <canvas ref="canvas" />
+    <div v-if="!imageSrc" class="frame-empty">No frame</div>
+  </div>
+</template>
+
+<style scoped>
+.frame-renderer {
+  width: 100%;
+  height: 100%;
+  min-height: 200px;
+  position: relative;
+}
+
+.frame-renderer canvas {
+  display: block;
+  width: 100%;
+  height: 100%;
+}
+
+.frame-empty {
+  position: absolute;
+  inset: 0;
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  color: var(--text-dim);
+}
+</style>