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The macOS desktop build could lose its draggable gutter on the right side of the tab bar once multiple session tabs consumed the native overlay title area. This adds a Tauri window-drag fallback for clicks on the tab strip's empty space while preserving tab and control interactions, and locks that behavior with focused regression tests. Constraint: Must preserve tab clicks, close buttons, and overflow controls while restoring drag behavior Rejected: Rework the title bar layout around a dedicated spacer | larger UI diff for a narrow hit-testing bug Confidence: high Scope-risk: narrow Reversibility: clean Directive: Keep drag fallback limited to true empty gutter hits; do not trigger it from interactive tab descendants Tested: bun run test src/components/layout/TabBar.test.tsx; bun run lint; bun run build; manual macOS app verification Not-tested: Windows runtime drag behavior was not manually exercised after this change Related: #92