fix(web): render tooltips above dropdowns

[extoci]

What Changed

• Raised the shared tooltip positioner from z-index 70 to 140 so tooltips render above dropdowns and popovers at z-index 130.
• Added a focused regression test that enforces the tooltip-above-menu layering relationship.

Why

Dropdowns were recently raised from z-index 60 to 130 so they render above toasts, but tooltips remained at 70. As a result, help text for disabled dropdown items painted beneath the menu where their bounds overlapped.

Keeping tooltips at 140 preserves the newer dropdown-over-toast behavior while restoring the expected ordering for tooltips opened from within dropdowns.

UI Changes

Before

After

The interaction was verified in the real web client using the right-panel add-surface menu.

Checklist

• This PR is small and focused
• I explained what changed and why
• I included before/after screenshots for any UI changes

Model: GPT-5.6 Sol; harness: Codex in T3 Code.

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Note

Low Risk
Single UI stacking-order tweak with no logic, auth, or data-handling changes.

Overview
Raises the shared tooltip positioner z-index from z-70 to z-[140] so tooltips paint above dropdowns and popovers at z-[130].

This restores help text visibility for disabled menu items after dropdowns were previously raised above toasts.

^{Reviewed by Cursor Bugbot for commit cc4a8a6. Bugbot is set up for automated code reviews on this repo. Configure here.}

Note

Fix tooltip z-index to render above dropdowns in TooltipPopup

Increases the z-index of the tooltip positioner in tooltip.tsx from z-70 (70) to z-[140] so tooltips render above dropdown menus.

^{Macroscope summarized cc4a8a6.}

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[macroscopeapp]

Approvability

Verdict: Approved dcc03f3

Single-line CSS z-index fix to ensure tooltips appear above dropdowns. Minimal, self-contained visual layering change with no behavioral side effects.

^{You can customize Macroscope's approvability policy. Learn more.}

Dismissing prior approval to re-evaluate dcc03f3