73712994 disabled voice-first on native by gating the TTS preload behind
!isNativeAppRuntime(), which left App users with the degraded text bubble
plus a 播报 button. The voice-line, 转文字 toggle and 收起全文 markup were
still present but unreachable.
Re-enable the preload on every platform and open the transcript when the
message is created, so the answer is readable while synthesis runs.
Collapse the transcript when playback starts rather than when synthesis
finishes: on-device synthesis settles in 2-6s, so collapsing on ready
pulled the answer away mid-sentence. transcriptPinned records a manual
toggle so the automatic collapse never overrides the reader.
Bound the preparing bubble at 20s (the upstream DashScope ceiling) so a
stalled synthesis degrades to the plain text bubble instead of showing an
endless placeholder duration.
Replace the tautological assertion that pinned the previous behaviour by
matching source strings with assertions on the behaviour itself.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
adminandClaude Opus 5
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