clear_cache('files') drops the Rust picker but core.lua kept
state.file_picker_initialized set, so ensure_initialized short-circuited
on state.initialized and never rebuilt it. Every later FFFScan/search then
ran against a dropped picker (watcher logs "File picker not initialized"),
which SIGSEGVs on Linux.
Split ensure_initialized: one-time setup stays gated on state.initialized,
picker creation is gated separately on state.file_picker_initialized.
clear_cache now clears that flag via mark_file_picker_uninitialized so the
next ensure_initialized rebuilds the picker.
Closes#772
Co-authored-by: gustav-fff <286169375+gustav-fff@users.noreply.github.com>
Gustav the Bot
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