Mirror text field values (incl. EasyMDE content) to localStorage on every
edit and restore them on load. Clear the draft only when the server confirms
a successful post (.notices.success) — the invariant that guarantees text
survives validation failures, save errors, and session expiry (login form
shown → form absent → draft left intact for post-reauth restore). Photos are
not persisted (File/Blob can't serialize); on restore an inline hint says
they need re-selecting.
Refs R19 (preserve-on-failure), R20, KTD6.
m038
9a96d0f19e