The notification dropdown was trapped inside .shell-header's stacking
context (created by backdrop-filter). Even with z-index: 9999, it
remained below any element with a higher root-level z-index such as
modal overlays (1000), dialog overlays (1000), and fullscreen
terminals (1000).
- Render the dropdown via ReactDOM.createPortal into document.body
so it escapes all parent stacking contexts.
- Dynamically measure the bell button's bounding rect to position
the dropdown correctly with position: fixed.
- Update click-outside handler to also ignore clicks on the bell
button itself.
- Add window resize listener to keep dropdown aligned.
- Change .notification-dropdown from position: absolute to fixed.
Quality gates: tsc --noEmit (pass), build (pass)
Developer
6aea83bf17