Fix editorconfig violations in FTBFS dashboard template

[Copilot]

The editorconfig GitHub Actions job was failing on the newly added FTBFS dashboard template. The template contained multiple lines with odd-width left padding, which violated the repository’s .editorconfig indentation rules.

• Root cause

  • dashboard/templates/ftbfs.html used inconsistent leading whitespace on several HTML/Jinja and inline JS lines.
  • editorconfig-checker rejected these lines because indentation must be a multiple of 2 spaces.

• Change

  • Normalize indentation in dashboard/templates/ftbfs.html only.
  • Keep markup structure and behavior unchanged; this is a formatting-only fix targeted at the failing file.

• Example

  -       <h1 class="h5 mb-0 fw-bold">FTFBS report at {{ rebuild_pct }}% build</h1>
  +      <h1 class="h5 mb-0 fw-bold">FTFBS report at {{ rebuild_pct }}% build</h1>
  
  -       row.classList.toggle('d-none', !pkg.includes(q));
  +      row.classList.toggle('d-none', !pkg.includes(q));

[ana]

not super helpful