Update Gemini 2.5 Flash to point to latest (#1392)

src/ipc/shared/language_model_constants.ts

@@ -152,7 +152,7 @@ export const MODEL_OPTIONS: Record<string, ModelOption[]> = {
     },
     // https://ai.google.dev/gemini-api/docs/models#gemini-2.5-flash-preview
     {
-      name: "gemini-2.5-flash",
+      name: "gemini-flash-latest",
       displayName: "Gemini 2.5 Flash",
       description: "Google's Gemini 2.5 Flash model (free tier available)",
       // Weirdly for Vertex AI, the output token limit is *exclusive* of the stated limit.
@@ -175,7 +175,7 @@ export const MODEL_OPTIONS: Record<string, ModelOption[]> = {
     },
     // Vertex Gemini 2.5 Flash
     {
-      name: "gemini-2.5-flash",
+      name: "gemini-flash-latest",
       displayName: "Gemini 2.5 Flash",
       description: "Vertex Gemini 2.5 Flash",
       maxOutputTokens: 65_536 - 1,