feat: Make savings output prettier

[Pringled]

This PR makes semble savings prettier (using rtk gain as inspiration). It also drops the --verbose flag since the output is not that big anyway and it makes the code less complex.

Example:

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

Files with missing lines	Coverage Δ
src/semble/cli.py	100.00% <100.00%> (ø)
src/semble/stats.py	100.00% <100.00%> (ø)
src/semble/version.py	100.00% <100.00%> (ø)

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[greptile-apps]

Confidence Score: 4/5

Safe to merge; the changes are purely presentational and the core stats-accumulation logic is untouched.

The formatting rewrite is correct — bar fills are bounded, division-by-zero is guarded, and color detection follows the NO_COLOR spec. The only loose end is the now-unused sample_stats_file fixture and the absence of a rendering test for the By Call Type section that the fixture was well-suited to cover.

tests/test_stats.py — the sample_stats_file fixture should either be removed or wired to a new test for the call-type section.

Comments Outside Diff (1)

1. tests/test_stats.py, line 19-27 (link)

   Unused fixture after refactor

   sample_stats_file is defined here but no remaining test requests it — test_savings_output (which used it) was removed and its replacement (test_savings_output_token_suffixes) builds its own file. Beyond being dead code, the fixture contained both "search" and "find_related" records, so it was the natural basis for verifying the new "By Call Type" section renders correctly. Consider either removing it or adding a test that asserts call-type names appear in the formatted output.

   Note: If this suggestion doesn't match your team's coding style, reply to this and let me know. I'll remember it for next time!

_{Reviews (1): Last reviewed commit: "Update tests" | Re-trigger Greptile}