Shared filtered-list primitive (six pages hand-roll search)

[ApocDev]

At least six pages implement their own list filtering with a local useState plus toLowerCase().includes(...): routes/turd.tsx, routes/coherence.tsx, routes/factory.tsx, routes/block.tsx, routes/settings.tsx, routes/browse.tsx, and two more pickers inside routes/block.$id.tsx. Behavior drifts between them (what fields are matched, whether internal names match, ranking, empty-result text).

What to do

• Extract one shared primitive — a useFilteredList hook plus a search-input component — that standardizes: match against localized display names (and internal names as a hidden fallback), ranking via @tanstack/match-sorter-utils (already a dependency), and a consistent "no matches for X" empty state.
• Adopt it across the pages above; per-page column/field choices stay local.
• The command palette (Command palette: Ctrl+K / / search-everything #78) needs the same matching behavior, so building the primitive first (or extracting it from the palette work) avoids a third implementation.

Part of the polish epic #35.