明确 Autocal 录制按钮及中止结果

区分连续录制和到档标记，并验证中止重试的目录数量。相关测试与代码检查通过。

apps/autocal/config/locales/en_US.json

@@ -271,17 +271,22 @@
     "uv": "U / V (px)",
     "position": "Mesh position",
     "levels": "Load levels (N)",
-    "hold": "Suggested hold",
-    "reference": "Actual reference (N)",
-    "start": "Start trial recording",
-    "confirm": "Confirm current level",
-    "finish": "Finish and save",
-    "abort": "Abort and keep data",
+    "hold": "Planned hold",
+    "hold_tip": "The planned hold time is saved; levels and recording do not advance automatically.",
+    "reference": "Manual reference force (N)",
+    "start": "Record this site",
+    "start_tip": "Create one trial folder for this site and continuously record images and sensor output. This does not move the platform. One load-unload cycle uses this folder.",
+    "confirm": "Mark load reached",
+    "confirm_tip": "After reaching the target and entering the manual reference force, mark this level's start and begin its hold timer. Images are already recording.",
+    "finish": "Stop and complete",
+    "finish_tip": "After all levels are marked, stop recording, flush the files, and check this trial.",
+    "abort": "Abort this recording",
+    "abort_tip": "Stop recording, keep this folder, and mark it incomplete. Starting again creates a new folder; it does not resume this one.",
     "load": "Load",
     "unload": "Unload",
     "next_step": "Next: {branch} to {load:g} N",
-    "before_start": "Start trial recording first",
-    "ready_to_finish": "All levels confirmed; finish and save",
+    "before_start": "Select a site and start the input, then begin recording",
+    "ready_to_finish": "All levels marked; recording can be stopped",
     "no_step": "No step pending",
     "progress": "Progress {done}/{total} · {status}",
     "held": " · Current level held {seconds:.1f} s",
@@ -293,6 +298,7 @@
     "complete": "Complete",
     "incomplete": "Incomplete",
     "result": "{status}: {path}",
+    "incomplete_result": "This recording is incomplete; data written so far is at: {path}",
     "error": "Action failed: {detail}",
     "invalid_site": "Select a valid UV site first",
     "start_input": "Start camera or video input first",