Builds on #89551 (@calvinnwq, cherry-picked): his showCloseButton flag
hid the hover X; this completes the model so standing chrome can never
be closed at all, only shown/hidden (#89546).
- hideOnly pane chrome (sessions + Bots): no hover X, no middle/meta
click close, no Close verbs in the tab menu, excluded from
close-others/right/all sweeps
- zone right-click menu gains Show/Hide rows for the strip's chrome
tabs (Hide bots / Show sessions, localized in 6 locales)
- Cmd-K palette: auto-registered "Toggle <tab> tab" rows for every
hideOnly pane, on-screen truth semantics, plugin panes included via
registry subscription
- hides persist across launches (survive the enforced dock re-adopt);
reveal intent and Layout reset clear them
- last-visible-tab guard: hiding the zone's last shown tab is refused
with a toast, so the strip can never become an empty dead zone
Teknium
4ac938ddec