refactor(transcription_resizer): extract __init__ into smaller methods to fix R0915

[josiasdev]

Why is this change necessary?

The __init__ method of TranscriptionResizerWidget had 114 statements, far exceeding Pylint's limit of 50 (R0915: too-many-statements). The method was responsible for all UI construction — labels, group boxes, layouts, checkboxes, spin boxes, buttons, and signal connections — in a single monolithic block. This violated the Single Responsibility Principle, harmed readability, and made maintenance harder.

How was this tested?

All 5 existing tests in tests/widgets/transcription_viewer/transcription_resizer_widget_test.py were run and passed before committing:
uv run python -m pytest tests/ -k "transcription_resizer" -x -q

Pylint was also re-run against the file and now gives a 10.00/10 rating with no R0915 warning.

Notes for the reviewer

The extraction is purely mechanical — each UI section (Settings, Extend Endings, Resize Options, Merge Options) was moved into its own private method (_setup_settings_section, _setup_extend_section, _setup_resize_section, _setup_merge_section). No logic, no attribute names, no signal/slot connections were changed. The refactoring is safe and straightforward.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 82.87%. Comparing base (f5f67f7) to head (f40118a).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1537      +/-   ##
==========================================
+ Coverage   81.81%   82.87%   +1.05%     
==========================================
  Files         108      108              
  Lines       11599    11620      +21     
==========================================
+ Hits         9490     9630     +140     
+ Misses       2109     1990     -119     

Flag	Coverage Δ
Linux	81.60% <26.47%> (-0.11%)	⬇️
macOS	82.38% <100.00%> (+4.08%)	⬆️

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