[dezren39]

💡 What: Refactored cursor decorations in pkgs/id/web/src/cursors.ts to utilize ProseMirror's native DOM recycling instead of brute-forcing widget recreations with a global generation counter. Changed Decoration.widget to use factory functions (() => HTMLElement) and computed stable keys based on dynamic data like opacity and connectionState.
🎯 Why: Generating unique keys for widgets on every editor update bypasses ProseMirror's optimization to recycle DOM elements, triggering significant layout thrashing and garbage collection when cursors move or fade.
📊 Impact: Prevents costly O(N) widget recreation on every local/remote editor state change. Cursors are now properly recycled.
🔬 Measurement: Verify by inspecting the DOM during remote cursor updates — the <span> elements will now update and move gracefully rather than being completely destroyed and re-attached to the tree on every transaction.

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PR created automatically by Jules for task 15044504201595192371 started by @dezren39

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