The Files store was the only account-scoped store never wired into the
account lifecycle: account-state-manager clears email/contacts/calendar/
filter/identity/vacation on a switch, but not files. Because the Files
store is a global that outlives the FilesApp component, the previous
account's client + resources lingered in memory and resurfaced whenever
the drive was reopened after a switch - most visibly when the switch
happened on the mail view (FilesApp unmounted), the common normal-shell
flow that the FilesApp re-init effect alone does not cover.
Clear the Files store centrally in clearAllStores() alongside the other
account-scoped stores, so the reset happens on every switch path.
Tests:
- lib/__tests__/account-state-manager.test.ts: assert clearAllStores()
resets the Files drive (client, resources, pathStack, selection,
supportsFiles) with no cross-account leak.
- integration/tests/13-files-account-switch.spec.ts (dockerized Stalwart,
JMAP FileNode): seeds a distinct top-level folder in alice's and bob's
drives and asserts the on-screen drive swaps on a switch with no stale
folder - both switching off the Files view (mail -> switch -> open
Files) and on it (rail account switcher). Verified: passes with the fix,
fails (path 1) without it. New FileNode seeding helpers in helpers/jmap.ts;
openFiles/openMailView/driveEntry nav helpers in helpers/app.ts.
Stefan Hildebrandt
5c06ae8bc2