The desktop app and an installed PWA had a row across the whole window
with the title and the window controls. That row is gone. The rail,
sidebar, list and reader run to the top of the window in their own
colours, and the controls sit in the top row of whatever is rightmost.
- `lib/window-controls-overlay.ts` finds and marks those rows before
paint, and they reserve the controls' width through
`--titlebar-right-inset`
- the rows and the rail are the drag area, everything clickable is
`no-drag`, and an invisible band lets a page with no row still move
- settings and the admin shell get a row only under the overlay, Pro's
tab strip and Mountain View's bar match the controls' height
- Alt floats the menu over the top left, in `window-menu-bar.tsx`
- skeletons carry the same marks, so nothing shifts when the app loads
An installed app had no title bar of its own, no way to save attachments
except a zip, and "pop out" stayed inside the page. A new window was a
second copy of the app that had to restore the session itself, and on
start-up that evicts any login made without "Remember me" from the list
every window shares.
- Title bar: `display_override` with `window-controls-overlay`, one
`--titlebar-inset` variable at the page roots and skeletons, and a drag
strip with the window title. 0 without an overlay, so nothing moves.
- Save all to a folder: `showDirectoryPicker`, asking the device policy
before the picker and before each file, with the zip as the fallback.
- Pop-out routes `/popout/message/<id>` and `/popout/compose`, on offer in
an installed app or when the desktop bridge has windows. Hidden in Lite.
- A pop-out borrows the main window's session and never evicts or starts a
token timer. Every renewal now takes a Web Lock, so two windows can't
send the same refresh token, which Stalwart 1.0 may treat as a replay.
- A draft moves to its window under the same id. A closing window hands
unsaved text to the main window to save, since its own request wouldn't
survive the close.
- Read state, drafts, theme and language follow across windows, and
`html[data-desktop]` gates the app-like behaviour in `app/desktop.css`.
Linus Rath