feat(providers): add gemini web search provider (#2763)

* add gemini web search provider

* fix(web): prefer free providers before Gemini in auto mode

* fix(web): expose gemini api key and model settings

* fix(web): prefer configured providers before Gemini in auto mode

* fix(web): satisfy gemini lint checks

* fix(web): address gemini provider review feedback

* test(web): align auto-provider expectations

* fix(web): let gemini ignore search range

web/frontend/src/api/tools.ts

@@ -30,6 +30,7 @@ export interface WebSearchProviderConfig {
   max_results: number
   base_url?: string
   api_key?: string
+  model?: string
   api_key_set?: boolean
 }
 

web/frontend/src/components/agent/tools/web-search-provider-settings.tsx

@@ -30,10 +30,13 @@ const apiKeyProviders = new Set([
   "brave",
   "tavily",
   "perplexity",
+  "gemini",
   "glm_search",
   "baidu_search",
 ])
 
+const modelProviders = new Set(["gemini"])
+
 export function WebSearchProviderSettings({
   providerLabelMap,
   settings,
@@ -226,6 +229,27 @@ function ProviderCard({
                 />
               </ProviderField>
             )}
+
+            {modelProviders.has(providerId) && (
+              <ProviderField
+                label={t("pages.agent.tools.web_search.model", "Model")}
+              >
+                <Input
+                  value={settings.model ?? ""}
+                  onChange={(event) =>
+                    updateSettings((current) => ({
+                      ...current,
+                      model: event.target.value,
+                    }))
+                  }
+                  placeholder={t(
+                    "pages.agent.tools.web_search.model_placeholder",
+                    "Optional model override",
+                  )}
+                  className="bg-muted/40 hover:bg-muted/60 focus:bg-background focus:ring-primary/20 h-10 rounded-xl border-transparent shadow-none transition-colors"
+                />
+              </ProviderField>
+            )}
           </div>
         </div>
       )}