Make the startup log a bounded, soft-refreshing scrolling viewport

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.

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