接入 Autocal 实时相机及帧时间显示

视频和相机共用 Finger worker，并保留采集时间、源帧编号及媒体时间。通过界面、采集链和真实视频验证。

apps/autocal/config/locales/en_US.json

@@ -233,24 +233,34 @@
     "reserved_points": "The calibration point table and capture controls will appear here: platform coordinates, reference load, sampling statistics and the resulting sensitivity."
   },
   "source": {
+    "kind": "Input source",
+    "kind_video": "Video file",
+    "kind_camera": "Live camera",
     "video": "Finger video",
+    "camera_index": "Camera index",
     "config": "Sensor config",
     "browse": "Browse…",
-    "start": "Play video",
+    "start": "Start input",
     "stop": "Stop",
-    "idle": "Choose a video and sensor.json",
+    "idle": "Choose an input source and sensor.json",
     "no_frame": "Waiting for processed frames",
+    "preview_only": "Use this page to check the input image. Calibration trial recording is not connected yet.",
     "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",
+    "missing_input": "Choose an existing sensor.json and, for video mode, a video file",
+    "opening": "Opening input…",
+    "running": "Processing frames",
     "stopping": "Stopping…",
     "stopped": "Stopped",
     "finished": "Video finished",
-    "error": "Video processing failed: {detail}",
-    "frame": "Frame {frame} · acquired at {time:.3f}"
+    "disconnected": "Camera disconnected",
+    "failed": "Acquisition failed; check the input source",
+    "error": "Acquisition or processing failed: {detail}",
+    "basis_replay": "decoded now",
+    "basis_camera": "camera received",
+    "basis_unknown": "read time (source unverified)",
+    "frame": "Frame {frame} · source {source_frame} · {basis} {time} · dropped {dropped}"
   },
   "finger": {
     "title": "Finger calibration-point debug",