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fix: capture.rs type mismatch (i32 + u32) and refs_format.rs unused import

fix: remove unused imports in capture.rs and autofill.rs

fix: browser capture uses correct absolute screen coordinates (window outer position + webview logical position * scale)

feat: browser capture using screenshots crate with proper DPI-aware window-region math + hide-webview-first snip flow

fix: make web clipping commands stable-tauri only with explicit unsupported errors

feat: implement native webview viewport capture hooks for Windows, macOS, and Linux

refactor: make browser capture architecture cross-platform with native engine abstraction

fix: make WebView2 CDP callback sender ownership safe

feat: browser capture - add WebView2 renderer screenshot commands for web clip/snipping