fix(sdk): preserve partial assistant message on chat stream failure #8778

Job	Run time
Detect changes	7s
code-quality / code-quality	31s
runops-guard / runops-guard	20s
internal / 🧪 Unit Tests: Internal	20s
typecheck / typecheck	20s
packages / 🧪 Unit Tests: Packages (2, 3)	19s
sdk-compat / Bun Runtime	15s
packages / 🧪 Unit Tests: Packages (1, 3)	19s
sdk-compat / Cloudflare Workers	19s
sdk-compat / Node.js 26.4 (warp-ubuntu-latest-x64-4x)	19s
sdk-compat / Deno Runtime	19s
packages / 🧪 Unit Tests: Packages (3, 3)	19s
e2e-webapp / 🧪 E2E Tests: Webapp	19s
sdk-compat / Node.js 20.20 (warp-ubuntu-latest-x64-4x)	14s
sdk-compat / Node.js 24.18 (warp-ubuntu-latest-x64-4x)	19s
webapp / 🧪 Unit Tests: Webapp (1, 12)	19s
webapp / 🧪 Unit Tests: Webapp (3, 12)	19s
sdk-compat / Node.js 22.23 (warp-ubuntu-latest-x64-4x)	19s
webapp / 🧪 Unit Tests: Webapp (6, 12)	19s
webapp / 🧪 Unit Tests: Webapp (2, 12)	19s
webapp / 🧪 Unit Tests: Webapp (4, 12)	19s
webapp / 🧪 Unit Tests: Webapp (7, 12)	19s
webapp / 🧪 Unit Tests: Webapp (5, 12)	19s
webapp / 🧪 Unit Tests: Webapp (11, 12)	19s
webapp / 🧪 Unit Tests: Webapp (8, 12)	19s
webapp / 🧪 Unit Tests: Webapp (9, 12)	19s
webapp / 🧪 Unit Tests: Webapp (10, 12)	19s
webapp / 🧪 Unit Tests: Webapp (12, 12)	19s
e2e	-1s
packages / 📊 Merge Reports	1s
webapp / 📊 Merge Reports	1s
All PR Checks	5s
	8m 52s

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