docs: task 7 owns the shortcut window and the overview page

Task 1's review found two user-facing files that no task owned: src/ui/shortcuts.ui
still describes four accelerators as showing and hiding panes, and
src/help/01-overview.txt still lists the five-revealer column. Both were made false
by the tabbed sidebar and neither is caught by a probe, so give them an owner.

docs/superpowers/plans/2026-10-14-sidebar-tabs.md

@@ -1186,6 +1186,7 @@ history every time you look at the trigger.
 - Modify: `src/ui_app.hpp` — declare both
 - Modify: `src/ui.cpp:5401` area — register `UDPSCOPE_PROBE_SIDE_TAB_MS`
 - Modify: `docs/claude/probe-readings.md`, `docs/claude/verification.md`, `docs/claude/invariants-gtk-and-chrome.md`, `docs/claude/invariants-math-channels.md`, `docs/claude/invariants-readouts-and-cursors.md`, `README.md`
+- Modify: `src/ui/shortcuts.ui` and `src/help/01-overview.txt` — the user-facing text Task 1 made false (added after Task 1's review found it owned by no task)
 - Test: the new probe itself
 
 **Interfaces:**
@@ -1367,6 +1368,15 @@ In `docs/claude/probe-readings.md`:
 - `docs/claude/invariants-readouts-and-cursors.md`: a readout quotes a stored sample, so with the
   instruments off it blanks every cell to `"--"` rather than keeping the last values; the panel
   itself stays on screen, insensitive.
+- `src/ui/shortcuts.ui`: the four descriptions Task 1 made false — `:49` `t` and `:69` `c` still
+  say "Show or hide…" where both now enable/disable a feature, and `:76` `m` / `:83` `g` still
+  name the measurements and math *panes* where both now select a tab. `src/shortcuts.cpp`'s table
+  is the application's dispatch and was corrected in Task 1; this file is the presentation the
+  user reads, and the `[help]` probe compares row *counts* only, so nothing catches the drift.
+- `src/help/01-overview.txt`: `:34` lists "the pane switches -- signal list, cursors,
+  measurements, math, side panel" and `:38` "the trigger, cursors, measurements and math panes at
+  the top". Both describe the five-revealer column. Rewrite as the two tabs and the controls that
+  survive.
 - `README.md`: a note under the deviations recording that `SPECS.md` names the panes as separate
   collapsible sections, and the built sidebar is two tabs with the math list folded into the
   signal list — with the reason (five sections in one 320 px column left every one of them short