Merge remote-tracking branch 'origin/master' into worktree/custom-deepseek-models

# Conflicts:
#	.agents/notes/implemented/architecture/2026-07-30-web-config-plane.i18n.yaml
#	.agents/notes/implemented/feature/2026-07-24-web-session-model-selector.i18n.yaml
#	packages/client/ui-model/README.i18n.yaml
#	packages/client/ui-model/README.zh.md
#	packages/client/ui-models/README.i18n.yaml
#	packages/client/ui-models/README.zh.md
#	packages/host/apiproxy/README.i18n.yaml
#	packages/llm/llm-deepseek/README.i18n.yaml

apps/web/tests/lifecycle-chrome.e2e.ts

@@ -104,6 +104,10 @@ describe('web e2e: lifecycle & chrome (workspace flow / reload / dark mode)', ()
       await input.press('Enter')
       const planButton = activePage.getByRole('button', { name: 'Plan mode on, press to turn off' })
       await planButton.waitFor({ timeout: 10_000 })
+      // The golden encodes an empty composer, and the button arriving does not
+      // mean the submitted text is gone yet: under load the capture caught a
+      // textbox still holding `/plan`.
+      await expect.poll(() => input.inputValue(), { timeout: 10_000 }).toBe('')
       const planSnapshot = await captureStableAria(activePage, '[class*="frame"]', activeScaffold.workspaceCwd)
       await compareOrRefreshGolden(PLAN_ACTIVE_EXPECTED, planSnapshot, MODE)
       const planStyle = await planButton.evaluate((element) => {