Fixes db-test#1118.

Problem

In a DB-graph Table view, opening search and typing caused the input to unmount after the 300ms debounce. The filter still applied, but the field collapsed back to the magnifying-glass button.

loaded-view-aux puts debounced-input into view-resource-context. When that value changes, use-resource refetches and view-data becomes nil. The component then swapped the entire view-container (including the search toolbar) for skeletons. search keeps show-input? in local React state, so remounting reset it to false.

Change

• Keep the last successful view-data while a refetch is in flight (stale-while-revalidate). Skeletons are used only on the initial load, when there is no previous payload.
• Keep the search input visible whenever the query is non-empty, so a remount cannot collapse a typed filter. Escape and the X button still clear the query and collapse the field.

Test plan

• bb dev:test -v frontend.components.views-test
  • Initial view-data nil still shows skeletons and does not mount view-container.
  • After a successful load, a nil refetch keeps the toolbar mounted and preserves the last payload plus the typed query.
  • Search with a non-empty query stays open after remount; empty query still collapses.
• Manual: open a DB-graph Table view, click search, type several characters across the debounce. The input should stay focused/open. Escape / X should still close and clear it.