Miscellaneous fixes (0.18 beta) (#23755)

* resolve saved credential sentinel to the stored api_key in the GenAI probe

* add profile faq

* center the multi-camera export time range on the current playback position

* add faq about preview restart cache

* clarify exports bulk download

web/src/components/config-form/theme/widgets/GenAIModelWidget.tsx

@@ -160,6 +160,7 @@ export function GenAIModelWidget(props: WidgetProps) {
     try {
       const res = await axios.post<ProbeResponse>("genai/probe", {
         provider: formProvider,
+        name: providerKey,
         api_key:
           typeof formEntry.api_key === "string" ? formEntry.api_key : null,
         base_url: