接入 Autocal Finger 视频预览

复用 shared FingerAcquisitionWorker 显示处理后画面，并保存视频与配置路径。通过针对性测试和真实视频验证。

apps/autocal/config/locales/en_US.json

@@ -232,6 +232,26 @@
     "reserved_surface": "Multi-point calibration sensitivity will be drawn as a colour map on the sensor's 3D surface here: each point's sensitivity interpolated and coloured, with a legend and range.",
     "reserved_points": "The calibration point table and capture controls will appear here: platform coordinates, reference load, sampling statistics and the resulting sensitivity."
   },
+  "source": {
+    "video": "Finger video",
+    "config": "Sensor config",
+    "browse": "Browse…",
+    "start": "Play video",
+    "stop": "Stop",
+    "idle": "Choose a video and sensor.json",
+    "no_frame": "Waiting for processed frames",
+    "choose_video": "Choose Finger video",
+    "choose_config": "Choose sensor.json",
+    "video_filter": "Video files (*.mp4 *.avi *.mov *.mkv);;All files (*)",
+    "missing_input": "Choose an existing video file and sensor.json",
+    "opening": "Opening video…",
+    "running": "Processing video",
+    "stopping": "Stopping…",
+    "stopped": "Stopped",
+    "finished": "Video finished",
+    "error": "Video processing failed: {detail}",
+    "frame": "Frame {frame} · acquired at {time:.3f}"
+  },
   "finger": {
     "title": "Finger calibration-point debug",
     "bundle_path": "Export bundle",