feat: icon-only toolbar and audio input follow-upsHEADmaster

Make the chat toolbar icon-only (tooltips retained) and add an icon_size config key, default 28, so the drawn glyphs can be scaled. Qt was drawing the 24px pixmaps at its ~16px default; the explicit icon size fixes that.

Fix the deferred audio minors: AudioRecorder.start() now halts a prior source and checks the source error, so a failed capture no longer claims to be recording. Send now validates every pending modality in one gate, so a mixed image+audio clip cannot reach a model without vision. Sub-second clips no longer name voice-note-0s.wav, and non-WAV audio containers classify as unknown, guarded by a test.

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