[fleizean]

Summary

The background grid behind the public and admin pages is visible in the light theme again.

Why

In the light theme the grid lines were stroke-gray-300/40: gray-300 (#d1d5db) at 40% on white comes out at about #eceef1, which is practically invisible. In the dark theme the same pattern reads as a faint grid.

Changes

• grid-pattern.html: light theme stroke stroke-gray-300/40 → stroke-gray-400/50. The dark theme stroke (dark:stroke-gray-700/30) and the fade masks are unchanged.

Notes for reviewers

Four tones were compared side by side on white (gray-300 at 100%, gray-400 at 50% and 70%, gray-500 at 50%); gray-400 at 50% is the closest match to the dark theme's subtlety. The component is used by the public layout and every admin page.

Checklist

• The pull request targets develop and is about one thing
• Commit messages follow Conventional Commits (feat(scope): ..., fix(scope): ...)
• CI is green (backend tests, frontend build and tests, dependency gate)
• Schema changes are EF Core migrations generated by the tool, not hand-edited
• A changed backend DTO has its TypeScript twin updated in src/frontend/src/app/core/models
• New dependencies are justified and their lock files are updated in the same commit
• No secrets, tokens or personal data in code, logs or this description
• Code comments are kept to a minimum; the reasoning lives in this description