ui: the sidebar's tabs become one dock; Measure and Signals by keyboard section; session keeps the dock's state

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

docs/claude/verification.md

@@ -412,12 +412,19 @@ precedent, not an exception.
   pauses, reports again with `dn=` per measurement, then resets and reports a third time. Three
   phases: `phase=0`, `phase=1` (after pause) and `phase=2` (after Reset). Needs
   `UDPSCOPE_ENABLE_ALL_MS` ahead of it and `UDPSCOPE_PROBE_MEASURE_MS` to add measurements first.
-- `UDPSCOPE_PROBE_SIDE_TAB_MS=3000` with `UDPSCOPE_EXIT_AFTER_MS=11000` — the measurements on the
-  Measure tab, a forced pass, then the tab switched away and read again two seconds later. **`advanced=4`
-  is the assertion** (every accumulator gained passes while its page was off screen); `advanced=0` is the
-  defect where the accumulation is gated on the visible tab, which would leave a gap in min/max/avg for
+- `UDPSCOPE_PROBE_SIDE_TAB_MS=3000` with `UDPSCOPE_EXIT_AFTER_MS=11000` — the measurements in the
+  dock's Measure section, a forced pass, then the dock scrolled back to the signal list (the Measure
+  section out of view) and read again two seconds later. The probe pads the dock to 3000 px so a scroll is
+  observable on a short window. **`advanced=4`
+  is the assertion** (every accumulator gained passes while its section was out of view); `advanced=0` is the
+  defect where the accumulation is gated on the visible section, which would leave a gap in min/max/avg for
   exactly as long as the trigger was on screen. It enables *and plots* its own signal, so it needs no other
-  probe ahead of it. The reading's own entry is in `probe-readings.md`.
+  probe ahead of it. The reading's own entry is in `probe-readings.md`. (Probe name `dock_section_probe`; the
+  variable and the `[side-tab-probe]` tag keep their old names so existing scripts keep working.)
+- `UDPSCOPE_PROBE_DOCK_SESSION_MS=2500` with `UDPSCOPE_EXIT_AFTER_MS=8000` -- the session file's `dock` key,
+  end to end: the dock hidden, saved and reloaded; shown again; and a file from the previous version
+  (`side_tab = "measure"`, no `dock`) loaded without an error. Three `[dock-session]` lines, each `ok=1`;
+  entries in `probe-readings.md`.
 - `UDPSCOPE_PROBE_SLIDEOVER_MS=1500` with `UDPSCOPE_EXIT_AFTER_MS=5000` (and `UDPSCOPE_ENABLE_ALL_MS=500`) -- the
   slide-over panel over the plot's right edge, opened on a throw-away `probe` page, read 0.5 s later. Two
   `[slideover]` lines. Line 1 must read `panel=360x<overlay height> ... edge_flush=1 full_height=1
@@ -631,12 +638,12 @@ as distinct from the fault injection below, which exercises ingest:
   bullet) — so a probe run against a fresh config directory will have it on screen for the first
   second and a half, and that start *writes* `tour_seen` to whichever config directory the run is
   using, which is why the second run against the same one reads `auto=0`.
-- `UDPSCOPE_PROBE_TOUR_SURFACE_MS` — the tour's *surface* switch: it puts the sidebar on **Measure**,
+- `UDPSCOPE_PROBE_TOUR_SURFACE_MS` — the tour's *surface* switch: it opens a slide-over page (`trigger`),
   starts the window's tour, and walks it a stop per tick to the signals stop, reading the sidebar's
   page and the spotlight/card where the walk arrives. It then puts the sidebar *away* and starts the
   tour again, which is the same filter's other case (a collapsed pane drops the stops a page switch
-  could have revealed). `[toursurface] signals stop=4/5 … side_tab=signals … contains=1` and
-  `[toursurface] collapsed: side_stack_mapped=0 steps=2 signals_stop=0` are the two assertions; its
+  could have revealed). `[toursurface] signals stop=4/5 … slideover=none … contains=1` and
+  `[toursurface] collapsed: side_box_mapped=0 steps=2 signals_stop=0` are the two assertions; its
   lines are in [probe-readings.md](probe-readings.md). Run it alone with
   `UDPSCOPE_EXIT_AFTER_MS=9000 UDPSCOPE_EXIT_DUMP=1` against a live source.
 - `UDPSCOPE_PROBE_DEFAULTS_MS` — opens **Calibrate** and reads every spin button in it and in the