统一实时标定身份解析并规范行尾

控制器与两个对话框共用 CalibrationService.read_identity，解析失败与缺 SN 分开上报；
本轮改动文件统一 LF，SN 必填回归已锁定。
定向 73 项、校准 UI 8 项与 lint 通过；未跑全量门禁。

apps/studio/config/locales/en_US.json

@@ -291,6 +291,10 @@
     "mode_replay_tip": "The charts read the open recording; capture and recording continue",
     "mode_recomputed": "Recomputed from this video (browsing)",
     "mode_recomputed_tip": "Curves come from this analysis, not forces.csv.",
+    "field_experiment": "Experimental model field_gain/1: weighted unloaded baseline {baseline} N ({frames} frames), mean extrapolation {extrapolated}%",
+    "field_experiment_tip": "This is an experimental estimate, not a validated local pressure or total force. Model fingerprint {fingerprint}; strategy {strategy}; unloaded reference {reference}; HHD grid {grid}, downsample {downsample}",
+    "field_unknown": "Unknown experiment source: this result carries no field diagnostics (probably an older cached result)",
+    "field_unknown_tip": "Older caches do not record the weighted baseline or per-frame extrapolation; re-run the analysis for full diagnostics",
     "mode_no_trace": "No force trace — {reason}",
     "mode_no_trace_tip": "There is nothing to plot, and the reason is a fact about the input rather than a loading state",
     "trace_not_analysed": "this video has not been analysed yet",
@@ -358,6 +362,7 @@
     "device_missing_sn": "This calibration file has no SN, so it cannot be matched to a sensor",
     "device_mismatch": "The calibration file's SN is {sn}, which is not the device id entered",
     "device_family": "This calibration belongs to {family}, not Finger",
+    "device_unreadable": "This calibration file cannot be read, so the sensor it belongs to cannot be confirmed ({error})",
     "reference": "Reference frame",
     "reference_time": "{seconds} s",
     "reference_missing": "The recording has no frame {frame}.",