fix(frontend): resolve npm audit advisories keeping Security Scanning red

[cristim]

Summary

• Bump @typescript-eslint/{eslint-plugin,parser} from ^6.0.0 to ^8.0.0 -- fixes GHSA-3ppc-4f35-3m26 / GHSA-7r86-cg39-jmmj / GHSA-23c5-xmqv-rm74 (ReDoS via minimatch in @typescript-eslint/typescript-estree)
• Bump copy-webpack-plugin from ^13.0.1 to ^14.0.0 -- fixes GHSA-5c6j-r48x-rmvq / GHSA-qj8w-gfj5-8c6v (RCE + DoS in serialize-javascript)
• Bump css-minimizer-webpack-plugin from ^5.0.0 to ^8.0.0 -- same serialize-javascript chain

All four are dev-only build/lint tooling. No --omit flags or audit-level loosening were added to CI. No config changes required: the webpack config uses CssMinimizerPlugin() with zero options (drop-in upgrade), and there is no ESLint config file in the frontend directory so the @typescript-eslint v6->v8 jump needs no rule changes.

Per-advisory notes

Advisory	Package fixed	Mechanism
GHSA-3ppc-4f35-3m26 + GHSA-7r86-cg39-jmmj + GHSA-23c5-xmqv-rm74	minimatch (transitive via @typescript-eslint/typescript-estree)	Bumping @typescript-eslint to v8 pulls in a non-vulnerable minimatch
GHSA-5c6j-r48x-rmvq + GHSA-qj8w-gfj5-8c6v	serialize-javascript (transitive via copy-webpack-plugin and css-minimizer-webpack-plugin)	Bumping both plugins to their latest major pulls in serialize-javascript >=7.0.5
GHSA-hmw2-7cc7-3qxx (form-data), GHSA-2g4f-4pwh-qvx6 (ajv), GHSA-25h7-pfq9-p65f/GHSA-rf6f-7fwh-wjgh (flatted), GHSA-4x5r-pxfx-6jf8 (@babel/core), GHSA-f886-m6hf-6m8v (brace-expansion), GHSA-q3j6-qgpj-74h6/GHSA-v39h-62p7-jpjc (fast-uri), GHSA-3mfm-83xf-c92r+ (handlebars), GHSA-h67p-54hq-rp68 (js-yaml), GHSA-r5fr-rjxr-66jc+ (lodash), GHSA-3v7f-55p6-f55p/GHSA-c2c7-rcm5-vvqj (picomatch), GHSA-qx2v-qp2m-jg93 (postcss), GHSA-xpqw-6gx7-v673 (svgo), GHSA-8fgc-7cc6-rx7x/GHSA-38r7-794h-5758 (webpack), GHSA-58qx-3vcg-4xpx/GHSA-96hv-2xvq-fx4p (ws)	All resolved by npm audit fix (semver-compatible updates)

Verification

npm audit --audit-level=high   -> found 0 vulnerabilities (exit 0)
npm run typecheck              -> exit 0
npm run build                  -> webpack 5.108.3 compiled (exit 0, perf warning pre-existing)
npm test                       -> 77 suites, 2553 passed, 1 skipped (exit 0)

Closes #1344

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Configuration used: defaults

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Run ID: 29c978b0-f918-4c66-819e-d12702c1fa78

📥 Commits

Reviewing files that changed from the base of the PR and between 5f712a0 and d7fa9c7.

⛔ Files ignored due to path filters (1)

• frontend/package-lock.json is excluded by !**/package-lock.json

📒 Files selected for processing (1)

• frontend/package.json

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix/frontend-npm-audit

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