fix(v7-f56b): badge no longer intercepts pointer events on DimEnvEditor

The absolutely-positioned symbolic-dim-warn-badge sat over the right
edge of the DimEnvEditor row (top:8, right:8), which intercepted
clicks on the Apply button when the badge was visible. The e2e
restoration step (apply consistent values to clear the warning)
could not click through.

vbgui/src/App.tsx:
- pointerEvents: 'none' on the badge — it's purely informational.
- top: 44 (instead of 8) so the badge clearly sits below the editor
  bar rather than overlapping it.

Playwright e2e/scenarios/56_symbolic_dim_warn.spec.ts passes 1/1
(1.1s) with real backend + frontend roundtrip — closes the F56b
visual-e2e acceptance criterion: typing nh=3 surfaces the live
mismatch indicator, Apply triggers the verify roundtrip, the canvas
badge renders with the correct H and nh*head_dim product, and
restoring nh=2 clears the badge after the next verify.

Ref: cppmega-mlx-j3qa.2

Author: apstenku123

vbgui/src/App.tsx

@@ -650,13 +650,16 @@ export function App(): JSX.Element {
                     data-testid="symbolic-dim-warn-badge"
                     role="alert"
                     style={{
-                      position: "absolute", top: 8, right: 8, zIndex: 5,
+                      position: "absolute", top: 44, right: 8, zIndex: 5,
                       background: "#fef3c7", color: "#92400e",
                       borderLeft: "4px solid #d97706",
                       borderRadius: 4, padding: "6px 10px",
                       fontSize: 12, fontFamily: "system-ui, sans-serif",
                       boxShadow: "0 1px 2px rgba(0,0,0,0.08)",
                       maxWidth: 320,
+                      // Badge is informational; never block clicks
+                      // on the DimEnvEditor Apply button beneath.
+                      pointerEvents: "none",
                     }}
                   >
                     <strong data-testid="symbolic-dim-warn-title">