fix(settings): English language should pick the .en model variant

[jatinkrmalik]

Setting Language to English (US) left Specialization on Standard multilingual, while the line under it recommended Small EN. Same weight either way, better English recognition, and the UI already knew which one it wanted.

Cause: tiny/base/small/medium are both size bucket names and the multilingual specialization ids. Default config stores those bare ids, so populate treated them as a locked multilingual choice and never applied the existing .en preference helpers.

This retargets those ambiguous standard ids when language implies English-only vs multilingual, and mirrors quantized pairs the same way (medium-q5_0 <-> medium.en-q5_0). Turbo/versioned large variants with no .en pair stay put.

Fixes #776.

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[greptile-apps]

Greptile Summary

This PR makes Whisper.cpp specialization selection follow the configured language, choosing matching English-only or multilingual variants where a valid pair exists.

• Adds helpers to identify standard paired variants and mirror quantized English/multilingual variants.
• Applies language-aware retargeting while populating the specialization selector.
• Adds focused coverage for bare size identifiers, quantized pairs, automatic/non-English languages, and unpaired large variants.

Confidence Score: 5/5

The PR appears safe to merge, with no concrete changed-code failure identified.

The new mapping is constrained to known Whisper.cpp variants, checks mirrored counterparts before selecting them, and leaves variants without valid language counterparts unchanged.

Important Files Changed

Filename	Overview
src/vocalinux/ui/settings_dialog.py	Adds guarded language-aware variant retargeting while preserving unsupported or deliberately unpaired specializations.
tests/test_settings_dialog.py	Covers standard, quantized, multilingual, English-only, and unpaired variant mappings.

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