Set friendly name for auto loaded chat models during first run

The chat model friendly name field was introduced in a8c47a70f. But
we weren't setting the friendly name for ollama models, which get
automatically loaded on first run.

This broke setting chat model options, server admin settings and
creating new chat pages (at least) as they display the chat model's
friendly name.

This change ensures the friendly name for auto loaded chat models is
set to resolve these issues. We also add a null ref check to web app
model selector as an additional safeguard to prevent new chat page
crash due to missing friendly name going forward.

Resolves #1208

src/interface/web/app/common/modelSelector.tsx

@@ -92,7 +92,7 @@ export function ModelSelector({ ...props }: ModelSelectorProps) {
                         disabled={props.disabled ?? false}
                     >
                         <p className="truncate">
-                            {selectedModel ? selectedModel.name.substring(0, 20) : "Select a model..."}
+                            {selectedModel ? selectedModel.name?.substring(0, 20) : "Select a model..."}
                         </p>
                         <CaretUpDown className="opacity-50" />
                     </Button>

src/khoj/utils/initialization.py

@@ -235,6 +235,7 @@ def initialization(interactive: bool = True):
 
             chat_model_options = {
                 "name": chat_model,
+                "friendly_name": chat_model,
                 "model_type": model_type,
                 "max_prompt_size": default_max_tokens,
                 "vision_enabled": vision_enabled,
@@ -275,6 +276,7 @@ def initialization(interactive: bool = True):
                         if not existing_models.filter(name=model_name).exists():
                             ChatModel.objects.create(
                                 name=model_name,
+                                friendly_name=model_name,
                                 model_type=ChatModel.ModelType.OPENAI,
                                 max_prompt_size=model_to_prompt_size.get(model_name),
                                 vision_enabled=model_name in default_openai_chat_models,