[liugedragon]

LDML k and kk patterns number hours from 1 to 24. Babel already formats midnight as 24, but parse_time() passes that value to datetime.time, which rejects it:

>>> format_time(time(0, 30), format="kk:mm", locale="en_US")
'24:30'
>>> parse_time("24:30", format="kk:mm", locale="en_US")
# raises babel.dates.ParseError

Normalize hour 24 to 0 when the pattern contains an actual lowercase k field. Use the existing pattern tokenizer to distinguish it from uppercase K and quoted text. This matches the LDML hour-field definition and the existing formatter.

Regression coverage checks all 24 hours across four patterns, including reordered fields, plus seven invalid-input controls for other hour cycles, quoted k, and out-of-range values. This change addresses the midnight value emitted by the formatter and preserves existing lenient parsing behavior for other inputs.

Validation on Windows / Python 3.13.4:

• New cases before the fix: 4 failed, 99 passed.
• New cases after the fix: 103 passed.
• Date/time module: 2,676 passed, 2 xfailed.
• Full suite with CLDR 49 data: 8,322 passed, 6 skipped, 2 xfailed.
• Ruff checks and git diff --check: passed.