统一力值阈值处理并保留原始采样

移除自动显示基线，使逐轴阈值统一作用于曲线、读数与记录输出，标定拟合继续使用原始采样。
共享层全量测试和相关 Studio 测试通过。

apps/studio/config/locales/en_US.json

@@ -32,10 +32,6 @@
     "scene3d_settings": "3D display settings…",
     "show_fps": "Show FPS",
     "show_diagnostics": "Diagnostics",
-    "raw_auto_zero": "Finger raw auto-zero at start",
-    "raw_auto_zero_tip": "Value cards only: estimate an idle bias and deadband after start. Curves, statistics and CSV keep the measured values.",
-    "raw_reestimate": "Re-estimate raw baseline…",
-    "raw_reestimate_tip": "Drop the current display baseline and re-estimate from the next quiet samples (value cards only).",
     "settings": "Settings area",
     "plot_settings": "Plot settings…",
     "rotate_arrows": "Rotate arrows 90°",
@@ -71,9 +67,10 @@
     "plot_shear_raw_max": "Shear raw max",
     "plot_shear_raw_max_tip": "Shear-force axis ±max for FX/FY in raw (uncalibrated) mode. 0 = auto range",
     "plot_deadband_n": "Zero threshold (N)",
-    "plot_deadband_n_tip": "Display deadband floor in Newton mode: a reading inside the threshold shows as 0 and the curve flattens on the zero line. 0 = auto (the noise estimated from the quiet startup window; Newton mode has no fixed floor). Display only — the record and forces.csv keep the measured values",
+    "plot_deadband_n_tip": "Absolute per-axis zero threshold in N. Values within the threshold become 0; 0 disables it. Recordings retain acquired and processed values",
     "plot_deadband_raw": "Zero threshold (raw)",
-    "plot_deadband_raw_tip": "Display deadband floor in raw mode (raw counts). 0 = auto (the built-in 50-count floor). Raise it by hand when the calibration data is suspect; display only",
+    "plot_deadband_raw_tip": "Absolute per-axis zero threshold in raw counts. Values within the threshold become 0; 0 disables it. Calibration fitting still uses acquired samples",
+    "plot_value_decimals": "Value decimals",
     "reset_defaults": "Reset to defaults",
     "plot_orientation_group": "Finger 2D presentation (2D only; the 3D view keeps the design frame)",
     "plot_orientation": "Orientation",
@@ -137,7 +134,7 @@
     "playback_needs_recording": "This video has no recording beside it (no forces.csv): replay needs a recording; to just watch the video open it as a video, or use View ▸ Analyze video",
     "playback_video_only": "Play this video (no recording beside it: the picture plays, the force charts are empty)",
     "reset_sensor": "Reset sensor",
-    "reset_sensor_tip": "Zero the sensor tracker (the device's own zero). Zeroing it also restarts the display baseline, so the curves and the value cards re-learn their zero from the next quiet samples; the curve history is kept — View ▸ Reset views (F8) clears the views.",
+    "reset_sensor_tip": "Reset the sensor tracker and its reference frame. Force thresholds remain as configured; chart history is kept.",
     "reset_sensor_unavailable": "Zero the sensor tracker — available while a session is running (start a run first).",
     "reset_display": "Reset display",
     "reset_display_tip": "Clear the accumulated display: the curves, cursor and value cards go back to their defaults and the replay returns to the start of the recording. There is no device session in this view, so nothing of the device is touched; the 3D camera is View ▸ Reset views (F8).",
@@ -286,7 +283,7 @@
     "value_unavailable": "n/a",
     "value_unavailable_tip": "No curve is loaded for {channel}, so it has no value in this unit (raw counts are never shown in its place)",
     "zero_zone": "zero zone",
-    "zero_zone_tip": "Display deadband after auto baseline; curves, statistics and CSV keep the measured values",
+    "zero_zone_tip": "This value is within the configured threshold; curves and output columns also show zero. Original samples are retained.",
     "unit_toggle": "Switch unit",
     "unit_toggle_tip": "Click to switch the three curves and readouts between newton and raw units",
     "browse_only_tip": "Drag or scroll on the chart to browse history"
@@ -482,8 +479,8 @@
     "capture_slow": "The camera delivers less than the configured frame rate: {detail}. The recording keeps the real rate. This is a capture-side (camera/driver) matter that software cannot change: use a camera that really does deliver 30 fps — after checking that the cable or port is not slowing this one down — and measure again.",
     "video_ended": "Video ended",
     "camera_disconnected": "Camera disconnected",
-    "reset_ok": "Sensor tracker reset (the display baseline restarts)",
-    "reset_pending": "Sensor zero requested; the display baseline restarts once the acquisition thread confirms…",
+    "reset_ok": "Sensor tracker reset",
+    "reset_pending": "Sensor tracker reset requested; waiting for acquisition-thread confirmation…",
     "reset_display": "Display reset: curves back to their defaults, replay at the start",
     "view_reset": "Views reset",
     "paused": "Paused: nothing is computed, the device stays connected",