chore: cargo clippy fixes (all changes already on main)

[devin-ai-integration]

Summary

Ran cargo clippy --fix and applied suggested fixes across 7 files (unused imports, collapsible if-let chains, needless lifetimes, redundant allocations). After merging main, all fixes were already applied upstream — this PR has an empty diff against main and can be closed.

What happened

1. cargo clippy --fix auto-fixed 7 files, including removing use tauri::Manager in apps/desktop/src-tauri/src/lib.rs
2. The tauri::Manager removal broke macOS CI — webview_windows() requires that trait in scope (only compiled under #[cfg(target_os = "macos")], so clippy on Linux didn't catch it)
3. Restored the import; after merging main, the remaining clippy fixes were already applied by other PRs
4. Net result: empty diff vs main

Review & Testing Checklist for Human

• Consider closing this PR — there is no diff against main. All clippy fixes are already applied.

Notes

• ~56 workspace members with macOS-only dependencies (swift-rs, objc2, tauri-nspanel, libspa) were excluded from the clippy run since they can't compile on Linux; those may still have clippy warnings addressable on a macOS machine.
• use tauri::Manager is not unused — it provides trait methods like webview_windows() used in #[cfg(target_os = "macos")] blocks. cargo clippy on Linux incorrectly flags it because those blocks are not compiled.

Link to Devin session: https://app.devin.ai/sessions/62a8c121e30d43d88645e5e5352ceec7

[devin-ai-integration]

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