build(deps): replace nested @popperjs/core CJS build with ESM fork globally (#15860)

The design-system package had a nested node_modules/@popperjs/core using
the original CJS-only distribution (no exports field), causing all
design-system unit tests to fail with a named-export error when
element-plus's ESM files tried to import { placements } from it.

The root node_modules already used @sxzz/popperjs-es (ESM fork) via a
bootstrap-scoped override, but that override did not apply to element-plus
inside the design-system. Promoting the override to a global entry fixes
all 113 previously failing test files (573 tests now passing) and makes
the bootstrap-specific override redundant.

Author: MilosPaunovic

ui/package-lock.json

@@ -145,9 +145,7 @@
     },
     "overrides": {
         "axios": "1.13.6",
-        "bootstrap": {
-            "@popperjs/core": "npm:@sxzz/popperjs-es@^2.11.7"
-        },
+        "@popperjs/core": "npm:@sxzz/popperjs-es@^2.11.7",
         "@codecov/vite-plugin": {
             "vite": "$vite"
         }