sec(frontend): pin npm dependencies to exact versions (closes #425)

[cristim]

Summary

• Replaces all 29 caret (^) version ranges in frontend/package.json with the exact versions already recorded in package-lock.json.
• Eliminates the attack surface where npm install (rather than npm ci) resolves a newer minor/patch release that may carry unaudited CVEs.
• No functional change: every pinned version is the version currently installed; the lockfile is unchanged.

Test plan

• All 29 dependencies + devDependencies entries verified to match package-lock.json exactly (node script).
• npx tsc --noEmit -- no errors.
• npm test --coverage -- 65 suites, 2142 tests passed, 1 skipped.
• npm ci in a clean environment (disk full locally; CI will exercise this).

[cristim]

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 6265f47d-6481-4582-a27e-5ae71097539b

📥 Commits

Reviewing files that changed from the base of the PR and between 4956d66 and 1b3bb89.

📒 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/425-wave19

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