fix: show copy failure state

[omribz156]

Summary:

• Catch rejected clipboard writes in CodeSnippet
• Show a translated failure state instead of Copied! when copying fails
• Add English and Hebrew copy-failure labels

Verification:

• npm ci --ignore-scripts --no-audit --no-fund
• npm run ui:build
• npx prettier --check ui/src/components/CodeSnippet.tsx ui/src/locales/en.json ui/src/locales/he.json
• C:\Program Files\Git\bin\bash.exe scripts/check-docs-updated.sh
• git diff --check

Note: npx tsc --project ui/tsconfig.json --noEmit --pretty false still fails on existing unrelated errors in AppShell.tsx and PlaywrightDashboard.tsx. GitHub Lint also fails on existing unused symbols in PlaywrightDashboard.tsx. The patch-specific missing icon import from the first local run was fixed, and the Vite build plus docs gate now pass.

This was implemented with Codex assistance and manually reviewed to keep the fix focused.

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