fix: 模型下载完成后自动选择该模型

[WEIFENG2333]

Summary

修复 #939 中 @philpw99 提到的 bug：下载模型后设定会变成 tiny。

问题原因：下载完成后代码尝试恢复之前的选择，如果失败就默认选第一个（tiny）。

修复：下载完成后自动选择刚下载的模型。

Test plan

• 下载一个模型（如 large-v2），确认下载完成后自动选择该模型

🤖 Generated with Claude Code

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Note

Ensures the settings select the newly downloaded Faster Whisper model instead of reverting to a default.

• After model download, rebuilds model_card.comboBox and sets the current selection to the downloaded model via its value
• Removes the prior "restore previous selection or select first (tiny)" fallback to prevent unintended tiny selection
• Progress and success notifications remain unchanged

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[cursor]

Wrong field compared, downloaded model never auto-selected

High Severity

The comparison enum_val.value == downloaded_model_value will never match because model["value"] contains strings like "faster-whisper-large-v2" while FasterWhisperModelEnum values are "large-v2". The code uses model["value"] but it needs to use model["label"].lower() to get the matching format. As a result, the downloaded model is never auto-selected, defeating the entire purpose of this fix.

 

[Copilot]

Pull request overview

This PR aims to fix a bug where after downloading a model, the selection would incorrectly default to "tiny" instead of automatically selecting the newly downloaded model.

Changes:

• Modified the _on_model_download_finished callback to automatically select the downloaded model instead of trying to restore the previous selection

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[Copilot]

The downloaded model value will never match the enum values. The model["value"] contains values like "faster-whisper-tiny", "faster-whisper-large-v2", etc., but FasterWhisperModelEnum enum values are "tiny", "large-v2", etc. (without the "faster-whisper-" prefix). The comparison enum_val.value == downloaded_model_value will always be false, so the newly downloaded model will never be selected.

To fix this, you need to extract the model name by removing the "faster-whisper-" prefix from the downloaded model value before comparing, or use the existing model_map logic that's already defined at lines 562-564 to properly map between the two formats.

Suggested change

	for enum_val in available:
	if enum_val.value == downloaded_model_value:
	# 将下载的模型值规范化为枚举使用的形式（去掉前缀 "faster-whisper-"）
	downloaded_model_name = downloaded_model_value
	prefix = "faster-whisper-"
	if downloaded_model_name.startswith(prefix):
	downloaded_model_name = downloaded_model_name[len(prefix) :]
	for enum_val in available:
	if enum_val.value == downloaded_model_name: