缩短 Studio 叠字与重复说明，色标只保留量程

去掉 depth_empty 与无用选区峰值文案，并修正「视图 → 分析视频」。已用 locale 单测与 depth_scale_text 核对；含证据录制的 wiring 用例本机跳过。

apps/studio/src/orisys_studio/frame_view.py

@@ -161,25 +161,19 @@ class FrameView:
             panel.set_shared_depth_scale(span)
 
     def depth_scale_text(self, frame: ImageFrame | None = None) -> str:
-        """The colour scale, plus — when the frame's depth is exactly zero — why it is flat.
+        """The colour scale for the depth now on screen.
 
-        A depth view of an all-zero map is a flat island in the ramp's low colour, which
-        looks the same as a broken view. The frame knows which it is: the pass stored the
-        channel, its non-zero count and its range, so "0 of 84,000 pixels" can be said
-        instead of leaving the operator to wonder. It is not the same statement as
-        ``panels.depth_unavailable``, which is for a frame that carries no depth at all.
+        ``frame`` is kept so callers can pass the painted frame; the label is
+        the latched / adaptive / fixed span. A frame with no depth channel is
+        handled by ``panels.depth_unavailable``.
         """
+        _ = frame
         span = self.active_depth_span()
-        text = "" if span is None else t(
+        if span is None:
+            return ""
+        return t(
             "panels.depth_scale", low=f"{span[0]:.3f}", high=f"{span[1]:.3f}"
         )
-        if frame is None or frame.depth is None:
-            return text
-        array = np.asarray(frame.depth)
-        if array.size and not bool(np.any(array)):
-            empty = t("panels.depth_empty", pixels=int(array.size))
-            return f"{text} · {empty}" if text else empty
-        return text
 
     def latched_domain_mask(self, frame: ImageFrame):
         """The 2D domain boundary to draw, latched for the session.