Add 24x24 black and white Indent logo variants

[johannkm]

Summary

• Adds 24x24 versions of the black and white Indent logos in PNG, SVG, and GIF formats
• PNG and GIF are downscaled from the originals using Lanczos resampling; SVGs set width/height to 24 while preserving the viewBox

New files

File	Format
black_indent_logo_24x24.png	PNG
black_indent_logo_24x24.svg	SVG
black_indent_logo_24x24.gif	GIF
white_indent_logo_24x24.png	PNG
white_indent_logo_24x24.svg	SVG
white_indent_logo_24x24.gif	GIF

Test plan

• Verify 24x24 PNG renders correctly
• Visually confirm SVG and GIF variants

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Issues

1 potential issue found:

• The 24x24 SVGs declare width="24" height="24" but retain viewBox="0 0 16 16", unlike the existing 16x16 SVGs where width/height matches viewBox. This renders correctly (SVG scales viewBox to fit) but is a minor inconsistency that could confuse future editors.

Summary

This PR adds 24x24 pixel versions of the black and white Indent logos in PNG, SVG, and GIF formats, supplementing the existing logo assets in the repository.

• Added black_indent_logo_24x24.{png,svg,gif} and white_indent_logo_24x24.{png,svg,gif} (6 new files)
• SVGs reuse the same path data as the existing 16x16 SVGs with width/height scaled to 24
• PNGs include proper anti-aliasing; GIFs use 1-bit transparency with shapes matching PNGs exactly
• Naming follows existing {color}_indent_logo_{size}.{ext} convention

CI Checks

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viewBox vs width/height mismatch: This SVG declares width="24" height="24" but keeps viewBox="0 0 16 16" from the original 16x16 SVG. This works correctly (SVG scales the 16x16 coordinate space to fill the 24x24 canvas), but differs from the existing convention where black_indent_logo.svg uses width="16" height="16" viewBox="0 0 16 16" with matching values. Not a bug, just a minor inconsistency.