fix(ui): right rail tabs: review fixes, launcher in the strip, strip never scrolls on common windows

Review fixes P1.1-P2.7: a panel hidden at mount gets its tab when revealed; any live opening of a rail panel makes it the owner, restores do not; a short lane scrolls the strip with a thin scrollbar and brings a newly opened tab into view once; the join and the panel cover stay inside the lane and the fillet shrinks to the room left; a share link carries an owner-collapsed peer as collapsed so the recipient opens the sender's panel; border-box on phones; the strip's column folds into the panel width at 721-760px; the focus ring draws inside the tab.

The compact Radio launcher moves from Context's header into a tool slot under the tabs on desktop (back into the header for the phone sheet) and always toggles the compact player, also while Context is open; the player's Details button leads to the Radio section. The jump-to-section role, its two labels and the #804 closings of the player on Context expansion and rail layout passes are gone with it.

The rail panels' own collapse arrows are hidden on desktop: the tab opens and closes a panel, Escape inside closes it and returns focus to the tab.

The tabs are denser and the rail climbs toward the HUD corner above its left-rail baseline when the strip's column is taller than the lane, so the strip no longer scrolls on windows down to about 680px tall; the measuring pass keeps the strip's scroll offset. scripts/qa-radio.mjs expectations follow the launcher's new role.

Co-Authored-By: Claude Fable 5.1 <[email protected]>

src/ui/applicationShell.js

@@ -115,18 +115,14 @@ export class StyleManager extends ShellFacade {
     this._panelChrome = new PanelChrome({
       elements: {
         _contextRadioDetailsBtn: this._contextRadioDetailsBtn,
-        _contextRadioDock: this._contextRadioDock,
         _leftPanelStack: this._leftPanelStack,
         _locationSearch: this._locationSearch,
         _ppToggles: this._ppToggles,
         _rightPanelStack: this._rightPanelStack,
       },
       operations: {
-        _setRadioDisclosure: (...args) => this._setRadioDisclosure(...args),
         _syncCctvPanelViewport: (...args) =>
           this._syncCctvPanelViewport(...args),
-        _syncContextRadioLauncherState: (...args) =>
-          this._syncContextRadioLauncherState(...args),
         _showToast: (...args) => this._showToast(...args),
       },
       readHud: () => this.hud,