Increase visual footprint, stop idle AudioLines when silent, and sync floating controls with window state

[userlg]

Motivation

• Make the visualizations occupy more of the canvas (user requested the spectrum bar and all visualizations to feel larger and match style).
• Ensure the floating control panel and settings dialog do not remain on-screen after the main window is minimized and that the control panel follows window movement/resize.
• Stop the AudioLines idle animation when no music is playing so it does not animate while silent.

Description

• Parent the control panel to the main window and add minimize/restore synchronization and repositioning on move/resize by updating src/ui/main_window.py (ControlPanel(self), changeEvent, moveEvent, resizeEvent, and _position_control_panel).
• Increase SpectrumBars visual weight in src/styles/spectrum_bars.py by changing self.num_bars to 72, reducing self.bar_spacing to 2, raising the baseline (baseline_y) and increasing bar/peak height calculations to fill more vertical space.
• Increase Waveform vertical occupancy in src/styles/waveform.py by raising amplitude and sample scaling so the waveform fills more of the canvas.
• Make AudioLines quiet when there is no audio by introducing idle_energy_floor and gating idle motion/time advancement, and increase layer spacing/reactivity for larger presence in src/styles/audio_lines.py.
• Compiled the modified modules to validate syntax using python -m compileall src and targeted compilation of changed files.

Testing

• Ran python -m compileall src which succeeded and showed updated modules compiled without syntax errors.
• Ran python -m compileall src/ui/main_window.py src/styles/spectrum_bars.py src/styles/audio_lines.py src/styles/waveform.py which succeeded for the changed files.
• Ran pytest -q but test collection failed due to missing environment dependencies in this environment (ModuleNotFoundError: No module named 'numpy' and No module named 'sounddevice'), so unit tests could not complete here.

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Codex Task

[chatgpt-codex-connector]

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[chatgpt-codex-connector]

Restore settings dialog after window is unminimized

When the main window is minimized, changeEvent forcibly calls self.settings_dialog.hide(), but unlike the control panel there is no state tracking to restore it; because _show_settings opens this dialog with exec(), minimizing while settings are open can terminate that modal session and drop the user's in-progress edits after restore. This affects users who open Settings, adjust values, then minimize the app before applying.

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