Fix repeated text matching in audio and video clips

[LauraGPT]

Summary

• initialize bracket-match state for every requested text segment in both audio and video clipping
• preserve the existing behavior of returning all repeated text matches when no offsets are supplied
• prevent a previous # segment's bracket match from leaking into the next segment
• format and surface offset warnings from both clipping entry points
• keep explicit timestamp_list clipping independent of text-match warning state
• add regressions for all affected audio and video paths

Problem

When an unbracketed query occurs more than once, proc() correctly returns multiple timestamp ranges. Both clipping paths then evaluate match in if len(ts) > 1 and match, but match was only assigned inside the bracket branch. This raises:

UnboundLocalError: cannot access local variable 'match' where it is not associated with a value

This is the repeated-text failure reproduced while answering Discussion #128.

Validation

• regression baseline on current main: 2 tests failed with the exact UnboundLocalError
• focused regression suite: 5/5 passed
• full repository unittest discovery: 19 passed, 1 optional live test skipped
• Ruff on the new test and targeted syntax/undefined-name rules on both changed files
• py_compile, formatter check, and git diff --check
• real MoviePy/FFmpeg smoke with a 4-second H.264/AAC input:
  • repeated query matched 0.5-1.0s and 2.5-3.0s
  • output duration: exactly 1.000s
  • output codecs: H.264 video + AAC audio
  • clipped SRT contains two consecutive 0.5-second 重复 entries
  • repeated offset query returned the formatted No.1 ... 2 periods warning in the final video message

[gemini-code-assist]

Code Review

This pull request initializes the match variable to None in the text-splitting loops of both clip and video_clip methods in funclip/videoclipper.py to prevent stale matches, and adds a new test suite to verify duplicate text matching. The review feedback identifies two issues in these loops: in clip, the log_append string contains unformatted placeholders, and in video_clip, log_append is constructed but never appended to the final message, causing warning logs to be lost.

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