feat: add a searchable buffer picker

src/main.rs

@@ -12,7 +12,7 @@ Usage: vamp [--config PATH | --no-config] [FILE]
 Default keys (configurable with config.bind):
 All modes: Ctrl+p command palette; type to filter, Ctrl+j/k or arrows select, Enter accept, Esc cancel
 Normal/Visual: Space is leader; Space Space opens palette; Esc cancels prefix
-Normal leader: Space w saves; Space b n/p/l/d next/previous/list/close buffer
+Normal leader: Space w saves; Space b n/p/l/d next/previous/pick/close buffer
 Files: Space o floating tree INSERT; Space e docked tree NORMAL (right by default)
        tree NORMAL: hjkl navigate; INSERT: type to filter, Ctrl+hjkl navigate; Enter toggles/opens
        i filters; Esc retains filter and returns NORMAL, then editor; Ctrl+u clears in either mode
@@ -56,6 +56,7 @@ Save actions: core.save, core.force_save, core.save_and_quit, core.force_save_an
          Reload preserves/clamps views and clears stale undo/redo; snapshots never reload
          Dirty buffers keep edits; missing/unreadable/invalid changed files keep text and warn
 Buffers: :edit PATH, :buffers, :buffer N, :buffer_next, :buffer_previous, :buffer_delete [N], :buffer_force_delete [N]
+         :buffers / Space b l searches IDs/paths; Enter switches, Esc/Ctrl+p cancels, Ctrl+u clears
          Aliases: bnext, bprev, bdelete, bdelete!; arguments and safety rules are unchanged
          :quit refuses any dirty buffer; both save-and-quit commands require all buffers clean
 Restart: :restart closes clean buffers; unsaved buffers remain open and block restart with a warning