feat(ui): list-controls framework — type-to-filter + sort for all list views (epic)

[thewrz]

Why

Two foundational UX behaviors users expect from modern list interfaces, built once as reusable modules (src/ui/list_controls/) and wired into any current or future view:

1. Type-to-filter — on enabled views, simply typing immediately filters the list (by tag/folder, file name, customized tile name) without clicking the search box first. Click-to-focus always keeps working.
2. Sorting — a chip with the active sort key + asc/desc chevron, and an options menu (name, date, length, …), persisted per view (filter text never persists — views start unfiltered on launch).

Grouping is deliberately out of scope for v1 (favorites #14 + folder categories already cover it); the sort menu keeps a group-by seam for when user-assignable tags land.

Full design spec: docs/superpowers/specs/2026-07-06-list-controls-design.md (committed 1a2cdb5).

Wiring matrix

View	Filter	Type-to-activate	Sort (default)
Main tiles	migrated onto FilterState	✅ (+ click stays)	SoundSortKey (Name ↑)
Slots	✅	✅	SlotSortKey (SlotNumber ↑)
Shortcut assignment	✅	✅	SlotSortKey (SlotNumber ↑)
Macros (#168)	✅	✅	MacroSortKey (Name ↑)
Settings	staged Discord-style search	❌ click-only	none

Children (dependency order)

• feat(state): capture file modified-time + first-seen (date-added) timestamps #195 — data enabler: file mtime + first-seen timestamps
• feat(ui): list-controls filter module + type-to-filter activation #196 — filter module + type-to-filter activation (+ main-grid migration)
• feat(ui): list-controls sort module — chip + options menu + persisted prefs #197 — sort module: chip + options menu + persisted prefs (tiles first)
• feat(ui): wire filter + sort into the slots view #198 — wire filter + sort into slots view
• feat(ui): wire filter + sort into the shortcut-assignment view #199 — wire filter + sort into shortcut-assignment view
• feat(ui): staged settings search (Discord-style) #200 — staged settings search (Discord-style)
• feat(state,ui): user-assignable sound tags + group-by #201 — user-assignable sound tags + group-by (backlog enabler)

#168 (macros view) consumes the framework — amended by comment there.

Related prior art: #8 (search bar), #87 (Escape/focus staging), #14 (favorites), #16 (bulk-import review screen — future consumer).