When a Desktop tab references a session id that exists in no profile DB
(deleted elsewhere, or a stale id after a profile rename / wiped backend),
the resume path already drops the window to a fresh draft without toasting
or hot-looping (62af32efe7, bounded by goneSessionVerdict). But the text
the user had typed into that session stayed stashed under the dead key in
`hermes:composer-drafts:v3` — not lost, yet invisible, because nothing ever
opens that key again. From the user's side the message just vanished.
The gone verdict now announces the dead key (`announceGoneSessionDraft`),
and the composer's swap onto the fresh-draft scope consumes it once
(`adoptGoneSessionDraft`): the stash moves into the new-chat bucket, the
composer is seeded with it, and an inline "Restored your unsent message"
strip with Undo appears above the input. Undo returns the text to the dead
key while it is unchanged (still recoverable by the same path); once edited
it only dismisses. Keyed on the one-shot announcement rather than on the
composer observing an id→fresh transition, because the composer remounts
across the drop (a loading route mounts no composer). A fresh draft that
already has text is never clobbered; an empty stash shows nothing.
Offer, don't hijack (apps/desktop/AGENTS.md): no navigation beyond the drop
that already happened, no focus move, no toast.
Live (headless Electron over CDP, worktree backend): type into a live
session → delete its row + restart the backend → reload at the dead id.
Before: route drops to #/, composer empty, text only in localStorage under
the dead key. After: same drop, composer holds the text, strip + Undo shown;
Undo empties the composer and puts the text back under the key; a second
open of the dead id shows no strip; a dead id with no stash shows nothing.
Fixes#111868
acccd54c67