The safe, self-contained wins from the #85 bundle: - **Mobile viewport.** The editor used `100vh`, which on mobile Safari/Chrome is the LARGEST viewport (URL bar hidden), so with the bar visible the canvas bottom and Fit button were pushed under the browser chrome. `100dvh` fixes it. - **Session expiry mid-chat.** A 401 during a chat turn was mapped to "the assistant is not available right now" — sending the user to debug a config problem that isn't there. Now it says the session expired and redirects to /login, preserving the path, like the rest of the app treats 401. - **Error toasts persist.** Error toasts were the primary report that a mutation failed, yet auto-dismissed at 4s with no way to retrieve them — look away and it's gone. Errors now stay until dismissed; info toasts still time out; both get a close button. - **Journal date filter.** `from`/`to` existed in the API and JournalFilter but had no UI, so "show me last spring" was unreachable. Added two date inputs (with a Clear) that feed the existing filter. No backend change. Deferred to their own follow-ups (too big for this bundle, or need a decision): revision-history retention/pruning, the agent toolbox's missing corrective tools, plop-level journal entries from the UI, and the editor's max-width cap (a layout call worth confirming rather than changing blind). The DESIGN.md API-listing drift the issue mentioned was already fixed in #89. Co-Authored-By: Claude Opus 4.8 (1M context) <[email protected]> Claude-Session: https://claude.ai/code/session_01H3zbym8Doka2d7D48maSgZ