Add security overrides for @xmldom/xmldom and postcss#581
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Adds package.json overrides to force patched versions of two vulnerable transitive build-tool dependencies: - @xmldom/xmldom >=0.8.13: fixes 5 HIGH CVEs (XML injection CVSS 7.5, DoS, node injection via CDATA/comments/processing instructions). All within the same major version — no API break. - postcss >=8.5.10: fixes GHSA-qx2v-qp2m-jg93 (XSS via unescaped </style>, CVSS 6.1). Same major v8.x — no API break. Both packages appear only in Expo/Metro build tooling, not the app bundle shipped to users. Reduces npm audit from 6 HIGH + 22 MODERATE to 0 HIGH + 28 MODERATE. Remaining MODERATE items require Expo SDK 56 or have no upstream fix available. uuid (<11.1.1) override was evaluated and deferred — forcing v9→v11 risks breaking the native iOS xcode npm package used by @expo/config-plugins. https://claude.ai/code/session_01XBXfKYaVBm1xmeaSQqvTnK
Add security overrides for @xmldom/xmldom and postcss
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