Resizable panels now animate open and closed

Resizable panels in the webapp no longer appear and disappear abruptly. When users open a detail panel—whether viewing run details, logs, deployments, or model information—the panel slides open with a smooth 200ms ease-in-out animation. Closing panels triggers the reverse animation.

The animation infrastructure was added as reusable primitives in the shared Resizable component: a global animation config defining timing and easing, a helper for controlling handle visibility, and a hook for freezing values during transitions to prevent content flicker.

This pattern was applied consistently across 11 pages including Runs, Logs, Deployments, Schedules, Batches, Models, Bulk Actions, and Waitpoints. A Storybook demo was added so developers can see the animation pattern in isolation.

Additional polish includes an animated search field that expands when focused with a clear button, improved table row hover states where text brightens, and fixes for a span selection bug and DOM nesting issues.