ThePendulum
8c34a0f0c2
Extracts a new PlayerPanel widget (video + its own seek slider/marker strip + its own centered frame-step/play/mute transport row) into player_panel.py. Both Source and Preview tabs now use one, so switching tabs switches a complete, independent monitor -- its own scrubber, its own play state, its own frame-stepping -- not just the video frame with a single shared play button underneath. main.py's global keyboard shortcuts (,/./space/left/right) now dispatch to whichever panel is active via a small _active_panel() helper, so they follow the same 'whichever monitor you're looking at' rule as the on-screen controls. MarkerStrip (clap detection) and the Mark Audio/Video/offset/export row stay outside the tabs, at the MainWindow level -- marking and exporting are inherently about the source file, not the preview clip, so only the timeline+transport moved, not the whole marking workflow. Updated every existing smoke test for the new win.source_panel.* / win.preview_panel.* structure (previously flat win.player, win.seek_slider, etc.), and added a new check to smoke_test_preview.py confirming the Preview tab's slider is a genuinely separate, functional widget -- dragging it seeks the preview player without moving the source player, which is the actual thing this change was for. Verified the full suite on the virtual Xvfb display, plus a live click-through (mark both events, build preview, confirm the Preview tab shows its own populated timeline/transport, not the source's).