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The installed app only handled mailto: and webcal: launches. The launch consumer dropped files, and nothing could hand a File to the composer or the import dialogs, because the pending mailto is JSON in sessionStorage. - manifest: `shortcuts` named in the browser's language, `file_handlers` for .eml, .ics and .vcf, and `share_target`, all with the base path and per-domain branding. Lite's manifest is unchanged. - `lib/launch-handoff.ts`: the one place files and links wait, in memory and in the Cache API, so they survive a sign-in that leaves the page. The desktop bridge can call the same functions, since launchQueue never fires in Electron. Sign-out clears it. - launch consumer: routes files by type, and takes a shortcut to an open window, which focus-existing would otherwise only focus. - .eml opens in a new host for the preview, also before sign-in, with the strictest device policy deciding about saving. .ics and .vcf open their import dialogs through a new `initialFile` prop. A .ics needs the server, so offline the dialog says so and carries on once back online. - composer: `initialFiles` goes through `addFiles`, so plugin vetoes and size limits still apply, also from a Pro compose tab. - `sw.js` takes the share POST before the offline check and keeps the files for the page. Without a worker, `/protocol/share` passes text and links on and the page says the files are lost. `protocol` joins the app sections and the handler pages join the shell, so a mailto: launch offline no longer gets a network error. Browsers without launchQueue or a service worker behave as before.