we (web engine): Experimental web browser project to understand the limits of Claude

Review fix: extract shared event handlers to eliminate duplication master

The 7 event handler callbacks (isFlipped, acceptsFirstResponder, keyDown:, mouseDown:, mouseUp:, mouseMoved:, scrollWheel:) were duplicated verbatim between WeView and WeMetalView class registrations (~120 lines). Extract them to module-level extern "C" functions and a shared register_view_event_handlers() helper. Also rename MetalView._state to MetalView.state since the field is actively used (not just kept alive for drop). Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>


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