subject: fix calibration cancel, unit mixing, FN clamping, export/apply and depth scale

apps/studio/config/locales/en_US.json

@@ -89,6 +89,9 @@
     "view_mode_tip": "Image display mode while running",
     "arrow_empty": "No image yet\nPick a video or camera, then press Run",
     "arrow_empty_tip": "The deformation arrow image appears here while running or previewing",
+    "depth_unavailable": "No depth data for this frame\n(not a depth of zero, and no silent fallback to the processed image)",
+    "depth_scale": "Depth scale {low} – {high}",
+    "depth_scale_tip": "Fixed for this session: the range is latched to the first frame that carried depth so frames stay comparable. Grey marks samples with no depth.",
     "plots": "Force Charts",
     "cal": "Calibration",
     "mesh3d": "3D mesh",
@@ -122,12 +125,18 @@
     "col_std": "σ",
     "col_actions": "",
     "recording": "Recording calibration samples…",
+    "recording_stop_tip": "Click to cancel this calibration recording (always available)",
     "record_ok": "Recorded weight={weight} raw={raw}",
     "record_failed_few": "Recording failed — too few samples",
     "export_ok": "Exported {path}",
     "export_local": "Also wrote {path}",
     "export_warnings": "Skipped: {detail}",
-    "export_failed": "Export failed: {error}"
+    "export_failed": "Export failed: {error}",
+    "apply_title": "Apply calibration",
+    "apply_confirm": "Apply the calibration just exported to the current device?\n\nSensor type: {sensor_type}\nConfig: {config}\n\nChoosing No keeps the exported file and leaves the running device untouched.",
+    "apply_skipped": "Exported; not applied to the device",
+    "apply_done": "Calibration applied to {sensor_type}",
+    "apply_no_target": "No device to apply to (run an acquisition first)"
   },
   "status": {
     "ready": "Ready",
@@ -146,6 +155,8 @@
     "run_stopped": "Stopped",
     "run_stopping": "Stopping… (releasing the device)",
     "run_stopping_cancelled": "Connection cancelled (releasing the device)",
+    "sample_invalid": "Invalid sample (#{count}): {reason} — marked invalid and excluded from the curves and from calibration",
+    "samples_dropped": "Record buffer is full; the oldest {count} samples were released (the full session is no longer complete)",
     "run_failed": "Run failed: {error}",
     "video_ended": "Video ended",
     "camera_disconnected": "Camera disconnected",