perf: Lazy progress bar initialization in Levenshtein

[ESultanik]

Summary

• Avoid computing fringe_ranges dict when progress bar is disabled
• Reduces overhead for programmatic use and quiet mode

Changes

In levenshtein.py, the dict comprehension for fringe_ranges was computed even when DEFAULT_PRINTER.quiet was True. Now defaults are set first, and computation only happens when the progress bar will actually be shown.

Before:

if DEFAULT_PRINTER.quiet:
    fringe_ranges = {}
    fringe_total = 0
else:
    fringe_ranges = { ... expensive computation ... }

After:

fringe_ranges = {}
fringe_total = 0
if not DEFAULT_PRINTER.quiet:
    fringe_ranges = { ... expensive computation ... }

Test plan

• All 66 tests pass

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