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52d095e3c6
The tab bar's fifth item opened `<app-sidebar>` in a `wa-drawer` sliding in from the side, which is a desktop shape put on a phone: a 200px column of a 424px screen, opening away from the thumb that asked for it, with the rest of its 400px band empty. It also had three nested scrollers in it -- the dialog, its body, and the sidebar's own `overflow-y: auto` host -- so which box a drag moved depended on where the finger landed, which is the "only part of the screen scrolls under my finger" in the report. It is the same element with `placement="bottom"` and `without-header`, so the surface is the sheet #60 already built rather than a second pattern: a `wa-drawer` is a native `<dialog>` opened with `showModal()`, which is exactly the top layer that finding rests on, so the focus trap, Escape, tap-outside and `wa-after-hide` come along unchanged and nothing new has to be proved about paint containment. The sidebar is still mounted rather than re-listed as data, because the shell's own copy is `display: none` below 600px rather than removed -- a second list drawing `nav-*` handles is the duplicate-testid failure this component already renders conditionally to avoid. What `expanded` means had to grow to say the host owns the *box*: `app-sidebar` writes an inline width and caps itself at 400px, which beats any rule the host could write, so the width, the scrolling and the mouse-only resize handle now follow that attribute. The rows are 48px below 600px, stated in the sidebar's own stylesheet since that is the only place it renders there. Measured in the running app at 424x439: the sheet is 424 wide, 373 tall (85vh, so there is an outside to tap), rows 48px, one scroller with `overscroll-behavior: contain`, and Settings' row reachable at the end of it. Desktop and Compact are untouched. Closes #71