Order the startup log oldest-to-newest inside a height-bounded panel that
scrolls internally and never extends past the bottom of the window. Refresh it
with a background fetch that swaps the log list in place instead of reloading
the whole page, preserving the user's scroll position and only following to the
bottom when they are already there. A full page reload now happens only on the
final transition to the running server or to the error state.
Restyle the startup/migration holding page to match the Jellyfin dark theme,
with the inline wordmark logo, a gradient spinner and a recolored startup log
tree, and move the Morestachio template rendering into a reusable
StartupUiRenderer.
Add a curated, non-identifying "current activity" line to the always-visible
header (for example "Initializing server" or "Running migration X of Y"),
reported from the startup flow and the migration service so it never leaks
server details to unauthenticated clients. Move the log download into a
"Download logs" link in the log panel header, and show only the header, with
no log hints, to non-local clients.
