fix(NcSettingsSection): clear NcAppNavigation toggle overhang

[pringelmann]

Resolves

The NcAppNavigationToggle button overlaps the first NcSettingsSection heading on Nextcloud settings pages. This PR widen the section's inline-start margin so the heading clears the toggle. Falls back to the existing margin when used without an app navigation.

A companion server PR covers the legacy markup and Vue 2 line.

Fix

Widen the inline-start margin using max(). With an NcAppNavigation present, the formula evaluates to ~60 px and clears the toggle. Embedded without a nav, the max() falls back to the existing 28 px and the layout is unchanged.

🖼️ Screenshots

🏚️ Before	🏡 After

🚧 Tasks

• Check with design if growing left gutter is OK

🏁 Checklist

• ⛑️ Tests are included or are not applicable
• 📘 Component documentation has been extended, updated or is not applicable
• 2️⃣ Backport to stable8 for maintained Vue 2 version or not applicable

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 54.60%. Comparing base (26d6db4) to head (d40e003).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #8554   +/-   ##
=======================================
  Coverage   54.60%   54.60%           
=======================================
  Files         106      106           
  Lines        3443     3443           
  Branches     1004     1005    +1     
=======================================
  Hits         1880     1880           
  Misses       1322     1322           
  Partials      241      241           

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