Remove Titlebar top blank

[andotorg]

remove Titlebar top blank

Summary

Module pages (Extensions, Scheduled tasks, etc.) showed a large empty band under the frameless titlebar. .mainColumn already reserves --maka-plate-titlebar-clearance, and .maka-module-main[data-page-shell="layout"] also applied padding-top: var(--space-16) (64px), so the inset was applied twice.

Remove the extra module-page top padding (padding: 0). Titlebar clearance stays solely on .mainColumn, and page content aligns to the top of the content plate again.

Verification

• Visual check: open Extensions / Scheduled tasks — the tall blank above the page header is gone; content still clears the titlebar chrome.
• Did not run full lint / typecheck / test suites (CSS-only change).

AI use

Select exactly one:

• No generative tool made a substantive contribution
• Generative tooling made a substantive contribution

Tool(s) and scope:

Cursor Agent — diagnosed the double titlebar inset and updated module-shell.css.

Checklist

• Tests cover the change and fail without it
• Lint, format, typecheck and the affected suites pass locally

Does this PR entail a change in behavior?

• Yes — described under Summary above
• No