Add the Status section to nodes#show and rebuild nodes#edit's action barerdgeist-revive-events

Retires content_for :subnavigation on nodes#show entirely -- Preview
was fully redundant with Links' own preview URLs in every state, and
Edit is now a permanent, always-rendered action inside the new Status
section rather than a link floating at the top, consistent with the
"action lives next to the info" pattern People already established
for Unlock. Status surfaces head/draft/autosave plainly and gates
Edit/Publish/Destroy/Discard on lock ownership specifically, not mere
lock presence -- @node.locked? alone would have blocked the lock
owner's own session, caught by the click-test and fixed here rather
than shipped.

nodes#edit's action bar is rebuilt to sit outside form_for (both
button_to calls render their own nested form, invalid HTML the
browser was silently stripping) with Save wired back in via
form="..." rather than needing to live inside the form tag at all.
Also brings the locked-and-ready-to-edit flash message, and the
visual polish from this session's click-test: consistent button
heights across the bordered and pill-shaped variants sharing a row,
spacing between Status's data and its actions, and error_messages
styling reusing the destructive-red vocabulary already established
elsewhere.

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