程序员阿江(Relakkes) 78d85f0c64 fix(desktop): apply active provider before first prompt (#844)
Materialize the active provider runtime for empty-session first prompts before the WebSocket prewarm and user message are sent. This keeps a clean install that adds a MiniMax provider from starting the first turn without the selected provider runtime.

Tested: bun test src/server/__tests__/conversations.test.ts -t "MiniMax provider turn"
Tested: bun test src/server/__tests__/websocket-handler.test.ts src/server/__tests__/conversations.test.ts -t "prewarm|active provider id|MiniMax provider turn|first-turn runtime synchronization"
Tested: cd desktop && bun run test -- --run src/pages/EmptySession.test.tsx -t "draft runtime|active provider runtime|creates a new session"
Tested: cd desktop && bun run test -- --run src/components/controls/ModelSelector.test.tsx -t "defaults blank provider-scoped runtime selections|selects provider-scoped runtime models"
Tested: cd desktop && bun run lint
Tested: cd desktop && bun run build
Not-tested: bun run check:desktop, unrelated full-suite failures in MessageList timestamp formatting and TabBar AbortSignal cleanup blocked the gate.
Confidence: medium
Scope-risk: narrow
2026-07-02 21:02:58 +08:00
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