DJ-90: Fix missing semicolon in ErrorMessage styled-jsx

[devin-ai-integration]

Summary

Fixes DJ-90: the styled-jsx .error-content rule in frontend/components/common/ErrorMessage.tsx was missing a semicolon after font-weight: 600, so the following background-color: rgba(240, 45, 45, 0.1) declaration was dropped by the CSS parser and every error banner rendered as plain red text with no background. One-character fix — adds the semicolon; no behavioural or API changes.

Verified: ./gradlew spotlessJavaCheck, ./gradlew build -x jacocoTestCoverageVerification, and cd frontend && npm run build all pass.

Before

After

Link to Devin session: https://partner-workshops.devinenterprise.com/sessions/434a8fed1291451abb7f7c5305ad9c6d

[devin-ai-integration]

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