All three artifact timestamp sources (message.timestamp,
session.last_active, session.started_at) are epoch SECONDS — the
transcript reader and session-date-groups both multiply by 1000 — but
the collector passed them straight to new Date() (ms), so every
artifact rendered as 1970-01-21. Normalize seconds to ms once at
collection; the Date.now() fallback stays ms.
Local file artifacts (e.g. D:\ComfyUI\output\*.png) fell through to
mediaExternalUrl() which yields a file:// URL the renderer cannot
load. Route through the desktop fs bridge whenever it exists —
readDesktopFileDataUrl already dispatches remote REST vs local
Electron internally (#83380).
thatssoheil
bceac696ae