Refine shared-webapp components and add UI utilities

[tjementum]

Summary & Motivation

A bundle of small, independent shared-webapp improvements consumed by account and back-office surfaces.

New shared components:

• LinkCard — stylized card with link affordance, used on the account index page.
• Chart — wraps recharts primitives with a consistent focus ring and accessibility-layer defaults. Direct recharts imports are now lint-blocked via .oxlintrc.json and the frontend rules.
• Badge — adds a warning variant and ties it into the TenantLogo initials fallback.

Component fixes:

• Table styling consolidated into the shared component (bg-background, rounded corners, <TableHeader> row styling), so consumers no longer need to re-apply utilities. Back-office tenant overview side-pane sizing tweaked alongside.
• MultiSelect popover can now expand beyond the anchor width so long labels render without clipping.
• useSmartDate always renders a 4-digit year and exposes omitYear / omitCurrentYear options for callers that need a shorter display.
• Sidebar overlay breakpoint raised from lg to xl; layout heights now offset by the banner so content isn't clipped behind it.

New utilities:

• Country flag emoji helper in shared-webapp/ui/utils/countryFlag.ts.
• Label helpers in account/BackOffice/shared/lib/api/labels.ts.

CI:

• Replace the npm run lint step in main.yml and account.yml with dotnet run --project developer-cli -- lint --frontend. The dev-CLI lint runs npm run lint internally and adds the missing-translation check, so it both lints and gates .po completeness in CI. Drops the now-redundant per-WebApp Run Back Office Lint step.
• Replace the per-WebApp npm run format + git diff --exit-code steps with a single dotnet run --project developer-cli -- format --frontend + diff check, since the dev-CLI format runs across all workspaces in one go.
• Fill in 2 missing Danish translations in application/shared-webapp/ui/translations/locale/da-DK.po ("Loading", "Open calendar") that were exposed once the dev-CLI lint started running.

Checklist

• I have added tests, or done manual regression tests
• I have updated the documentation, if necessary

[linear]

PP-1216

[sonarqubecloud]

Quality Gate passed

Issues
6 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud