ui: a signal's details sit directly under its name; its unit is user-changeable and saved with the session

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

docs/claude/probe-readings.md

@@ -2761,11 +2761,11 @@ the slide-over closed and the page was dropped by `signal_pages_sync()`. `pruned
 channel removed) and the slide-over was still on `trigger`, both by `slideover_page()` and by the stack's visible child; `0` is `signal_pages_sync()` parking the stack on the
 signals list while the title and the badge marker still name `trigger`; `-1` when there is no `trigger` page or no math channel could be added.
 
-A second line, `[signalpage] calibration identity=1/0 set=2.5/-1.25 pencils=2 pencil_edits_one=1`, reads the page's gain and offset rows
+A second line, `[signalpage] calibration identity=1/0 set=2.5/-1.25 pencils=3 pencil_edits_one=1 unit_edit=1 unit='V'`, reads the page's details grid (unit, gain, offset, then the CONFIG's read-only details) rows
 (`udpscope-gain` / `udpscope-offset` labels, one string rule: `format_calibration()`, up to six decimals with trailing zeros dropped): `identity` is what an
-uncalibrated signal shows, `set` what the page shows after `set_calibration(2.5, -1.25)` and `signal_pages_sync()` (the Apply path), `pencils=2` the two edit
+uncalibrated signal shows, `set` what the page shows after `set_calibration(2.5, -1.25)` and `signal_pages_sync()` (the Apply path), `pencils=3` the unit, gain and offset edit
 buttons, and `pencil_edits_one=1` that the gain pencil opens a dialog titled "Gain" with exactly one spin button and that Apply changed the gain only
-(offset stayed -1.25) and refilled the label. `-1` is no pencil / no dialog; `0` is a dialog that edits both or a label that did not follow the model.
+(offset stayed -1.25) and refilled the label. `unit_edit=1`: the unit pencil opens a dialog titled "Unit" with one entry, "kV" reached the model's signal and the page's `udpscope-unit` label, and an empty entry restored the declared unit (`unit=` prints it; it must be the mock's own). A rename bumps `generation()`, so the panels re-read the list and the measurement statistics restart. `-1` is no pencil / no dialog; `0` is a dialog that edits both or a label that did not follow the model.
 
 ## `[sigbadges]`