feat: add visual picker for extraction settings

Makefile

@@ -14,7 +14,7 @@ else
   PIP_INSTALL = $(PIP) install
 endif
 
-.PHONY: default install install-cpu install-rocm install-cuda extract extract-loud ast sync verify clean help
+.PHONY: default install install-cpu install-rocm install-cuda extract extract-loud picker ast sync verify clean help
 
 default: ast
 
@@ -26,6 +26,7 @@ help:
 	@echo "  make install-cuda   # force CUDA torch"
 	@echo "  make extract        # run extract.py (uses config.toml if present)"
 	@echo "  make extract-loud   # extract with loud-only gating (keep explosions/transients)"
+	@echo "  make picker         # visual picker: select start/duration before extraction"
 	@echo "  make ast            # run sync_audio_test.py (audio_sync_test, PyQtGraph GUI)"
 	@echo "  make sync LAG=0.042 # run apply_sync.py to mux synced output (LAG in seconds)"
 	@echo "  make verify LAG=0.042  # verify sync: video + dual waveform player"
@@ -86,6 +87,9 @@ extract:
 extract-loud:
 	@if [ -x $(PY) ]; then $(PY) extract.py loud; else python3 extract.py loud; fi
 
+picker:
+	@if [ -x $(PY) ]; then QT_QPA_PLATFORM=xcb QT_STYLE_OVERRIDE=Fusion $(PY) picker.py --config $(CONFIG); else QT_QPA_PLATFORM=xcb QT_STYLE_OVERRIDE=Fusion python3 picker.py --config $(CONFIG); fi
+
 sync:
 	@if [ -x $(PY) ]; then PYTHONPATH=. $(PY) apply_sync.py --config $(CONFIG) --lag $(LAG); else PYTHONPATH=. python3 apply_sync.py --config $(CONFIG) --lag $(LAG); fi