fix: restart simulated audio fallback after visualizer reload

[Kirtan-pc]

Description

Fixes the simulated audio fallback being permanently disabled after a visualizer reload by restarting it when the audio helper is still disconnected.

Changes

• reloadVisualizer() now restarts startSimulatedAudioFallback() after cleaning up the fallback timer when the helper is not the active bridge mode.
• The restart is guarded by the same conditions used in handleAudioBridgeStatusChange() (lastBridgeMode !== "helper" and !isQuitting), so the fallback stays stopped when the helper is connected or the app is shutting down.
• Visualizers reloaded via the context menu "Reload" option (or any code path calling reloadVisualizer()) keep responding to simulated audio when the helper is disconnected.
• Real helper audio behavior is unchanged.

Related Issue

Closes #399

Testing

• Verified all 43 unit tests pass with:

npm test

• Verified whitespace and formatting checks:

git diff --check

Benefits

• Audio reactivity no longer dies permanently after reloading the visualizer while the helper is disconnected.
• The simulated audio fallback resumes immediately after reload instead of requiring a helper reconnect or app restart.
• No behavioral change when the audio helper is connected.

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[github-actions]

🎉 Congratulations @Kirtan-pc! 🎉

Your pull request has been successfully merged into Paraline! Thank you so much for your valuable contribution and effort. Every single improvement helps make Paraline a better desktop experience for everyone! 🙌

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