[TheeCoderAhmed]

--rotate (the old --reverse) has no effect on --svg output. print_unicode checks reverse_commit_order, but print_svg never reads it, so the SVG always has the newest commit on top.

print_svg now mirrors the rows when the flag is set:

• Summaries and branch labels are placed at the mirrored row.
• Each commit's group of dots and lines gets a matrix(1 0 0 -1 0 H) transform that mirrors it around the same rows.
• The --debug branch lines use the mirrored row as well.

Output without --rotate is unchanged, and svg_keeps_newest_commit_on_top_by_default checks the order and that no transform is added.

Fixes #134

What I ran, on macOS with rustc 1.98.1:

• cargo test --locked passes. The two new tests in src/print/svg.rs build a two-commit repo in the temp directory.
• svg_rotate_puts_oldest_commit_on_top fails without the change.
• cargo fmt --check passes, and cargo clippy --locked --all-targets reports no warnings.

I did not run the binary or open the SVG in a viewer, so the picture itself is unchecked. The tests only cover a linear history, so a graph with merges has not been exercised with --rotate.