Closes 4 audit findings:
- Route TS interface now carries dispatch_mode (sync|async). Backend's
shared::route::Route has had this since 0012_routes_dispatch_mode but
the TS client silently always created sync routes and the list
display dropped the field. Add a Dispatch select to the new-route
form and an "ASYNC" badge in the route list.
- api.files.downloadUrl pointed to a never-registered backend endpoint.
The dashboard's live Download button was hitting 405. Add the GET
handler (AppFilesRead + FilesRepo::head + FilesRepo::get, Content-
Disposition: inline) at the same path that delete already used.
- F-T-003: adminRequest's 401 handler called goto(login) without a
recursion cap. If the login endpoint itself returned 401, the wrapper
looped until browser nav limits. Track consecutive 401s within a 10s
window and hard-reload to /login?reason=auth-loop after the third,
showing the user an explanatory banner. Any 2xx resets the counter.
- Login flow now honors a ?returnTo= query parameter. adminRequest and
the root layout both append the current location when redirecting to
/login; the login page validates the value is a same-origin admin
path (no open-redirect) and goto's there after successful sign-in.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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