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/USER-GUIDE.md

@@ -65,9 +65,11 @@ the badge bar. Drag the badge onto a plot row to add a trace; drag it again to a
 the same signal twice, or onto another badge to reorder the badges. The colour is per *signal*, so
 the same signal is the same colour wherever it appears.
 
-Clicking a signal's badge opens its own page: the colour, **Plot on** buttons for the rows, and
-**Gain** and **Offset**, shown as two aligned numbers with a pencil button each that edits that one value.
-They are applied at ingest, so the measurements and the export carry the same numbers the plot shows.
+Clicking a signal's badge opens its own page. Directly under the name are its **Unit**, **Gain** and
+**Offset** — each with a pencil button that edits that one value — and then what the stream declared about
+it (type, size, range, sample rate, timing). Below come the colour and the **Plot on** buttons for the
+rows. Gain and offset are applied at ingest, so the measurements and the export carry the same numbers the
+plot shows; a renamed unit is used there too and is saved with the session.
 
 ## 4. The window and navigation
 

docs/claude/invariants-session-and-export.md

@@ -23,7 +23,10 @@ Part of [CLAUDE.md](../../CLAUDE.md). These are rules that cost a defect to lear
   not follow the lock). `[sigbadges] drag_sources` is the reading, and `drag_sources` on the `signals panel:`
   line must be 0.
 - **The session is the layout.** `LayoutState` persists what makes a reopened scope look like the
-  one that was closed: the window, the rows and their slot signals, the calibration, **the enabled
+  one that was closed: the window, the rows and their slot signals, the calibration, **the unit renames**
+  (`[[unit]]`, `name` + `unit`, only the overrides; `ScopeModel::set_signal_unit` re-applies them to every CONFIG,
+  and `set_signals()` takes them off the incoming units before the "same stream" comparison so a reconnect still
+  keeps its history), **the enabled
   signals**, **the chosen trace colours** (`[[color]]`, `name` + `rgb = "#RRGGBB"` — only the
   *overrides*, so a stream's new signals still take the positional palette and a saved session does
   not freeze a colour that is meant to follow the signal list), **the math channels with their

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]`