feat(ui): add floating caption window with live transcription

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Add a frameless always-on-top caption window wired to the live capture
pipeline. Silence-based segmentation gates the audio so the model never
sees silence, and the panel background is painted in paintEvent with a
configurable opacity instead of a style sheet.

新增悬浮字幕窗（无边框、置顶、可折叠/展开），接入实时采集与流式转写。
分段由静音检测驱动，静音期间不送音频，避免模型对静音产生幻觉。底板
改为在 paintEvent 中绘制，不透明度可调。

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blumia committed 2026-10-12 13:32:16 +08:00

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