Faster list pages and smoother tab switching

Data pages now show their layout instantly while results load, and the dashboard no longer reloads everything when you return to the tab.

• Added instant loading skeletons to units, batches, parts, stations, deployments, commits, and API logs pages so they appear immediately instead of waiting on data
• Stopped the dashboard from refetching every open query when you switch back to its browser tab
• Sped up the measurement table by removing redundant per-row database work