Clean up unused Zustand store variables

[Copilot]

Summary

This PR removes 11 unused variables from the Zustand store configuration, eliminating 32 lines of dead code and improving codebase maintainability.

Changes

Through comprehensive static analysis of the codebase, I identified and removed the following unused store variables:

useThemeStore

• setColor: Method for dynamically setting theme colors. The store only uses refreshFromCSS() for color updates.

useModalStore

• toggleModal: Toggle method that was never called. Components use openModal() and closeModal() directly.

useSidebarStore

• openSidebar: Direct open method that was never used. Components only use toggleSidebar().
• closeSidebar: Direct close method that was never used. Components only use toggleSidebar().

useAudioStore

• setAudioRef: Setter method for the audio ref. The audioRef is read by components but never set through this method.

localSoundScapeStore

• t: State variable that was never read or used anywhere in the codebase.
• lineTimeUpdatedByClick: Boolean flag that was never read or used.
• clickCounter: Counter state (marked as "NEW" in code) that was never accessed.
• setLineTime: Setter method that was never called.
• setT: Setter method that was never called.
• incrementClickCounter: Increment method that was never called.

Impact

• Lines of code removed: 32
• File size reduction: 14% (226 → 194 lines in store.ts)
• Breaking changes: None
• Build status: ✅ All builds passing
• Lint status: ✅ No new issues introduced

Verification

All changes have been verified through:

• Static code analysis using grep searches across the entire codebase
• TypeScript compilation
• Vite production build
• ESLint validation

The remaining variables in the stores (lineTime, audioRef, etc.) are actively used and have been preserved.

Benefits

• Improved code clarity: Developers can now see only the store variables that are actually in use
• Reduced maintenance burden: Fewer unused variables to consider when making changes
• Better developer experience: Clearer understanding of the application's state management

Original prompt

Can you check if there are variables in the zustand store that are not used anymore?

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