Polish gallery layout, forms, and navigation

[nicosuave]

Design polish pass on the web gallery, with small knock-on fixes for the MCP workspace and file editor that share its styles.

• Detail header slimmed to 44px; tabs sit on the border; Share is secondary and solid buttons are reserved for save/create actions
• The open Schedule or Settings view shows as a tab; viewing a historical revision shows a "Revision N ×" chip and the Versions menu checks the current one
• Import project is its own view instead of opening inside the selected artifact
• One outlined button style inside panels, inputs match selects, shared monospace token (no more Courier fallback), custom disclosure chevrons
• Library rows stay one line (unsaved and Worker status dots instead of a second line)
• Worker apps get a status summary row, consistent headings, and readable revision dates
• Schedule status and run status dots, no repeated UTC labels, plainer run-history note; secret removal asks for confirmation
• Mobile header keeps one row with short library labels; light focus ring darkened to meet 3:1 contrast

The Schedule/Settings tab only appears while open, keeping the single-row header that the navigation test asserts. The Worker save bar stays on Deployments because redeploying after a failed restore uses it.