fix: apply clippy suggested fixes

[devin-ai-integration]

Summary

Addresses clippy warnings across multiple crates by applying the suggested fixes:

• analytics: Renamed AnalyticsPayload::new() to builder() to fix new_ret_no_self warning (methods named new should return Self)
• buffer: Added type aliases TextTransformation and MdTransformation to fix type_complexity warnings
• llama: Added #[allow(clippy::too_many_arguments)] to private process_generation function
• vvad: Replaced Result<_, ()> with custom VadError type to fix result_unit_err warning
• whisper-local: Changed to struct initialization syntax to fix field_reassign_with_default warning

Review & Testing Checklist for Human

• Verify all call sites of AnalyticsPayload::new() have been updated to builder() - grep the codebase to ensure no usages were missed
• Check if VadError type change in vvad crate affects any callers of predict_16khz() outside the modified files
• Run cargo clippy on the affected packages to confirm warnings are resolved

Recommended test: Run cargo clippy -p analytics -p buffer -p llama -p vvad -p whisper-local -p tauri-plugin-analytics -p tauri-plugin-windows and verify no new warnings appear.

Notes

• The too_many_arguments warning in llama was suppressed rather than refactored since it's a private function and refactoring would be invasive
• Link to Devin run: https://app.devin.ai/sessions/c914a64ac5b24168955640f01b8543c9
• Requested by: unknown ()

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