feat: model selection for given provider (#57)

* feat: model selection for given provider

* tweak: adjust cfg validation func, remove duplicated logic, consolidate agent updating into agent.go

* tweak: make the model dialog scrollable, adjust padding slightly for modal"

* feat: add provider selection, add hints, simplify some logic, add horizontal scrolling support, additional scroll indicators"

* remove nav help

* update docs

* increase number of visible models, make horizontal scroll "wrap"

* add provider popularity rankings

internal/llm/models/models.go

@@ -33,6 +33,15 @@ const (
 	ProviderMock ModelProvider = "__mock"
 )
 
+// Providers in order of popularity
+var ProviderPopularity = map[ModelProvider]int{
+	ProviderAnthropic: 1,
+	ProviderOpenAI:    2,
+	ProviderGemini:    3,
+	ProviderGROQ:      4,
+	ProviderBedrock:   5,
+}
+
 var SupportedModels = map[ModelID]Model{
 	//
 	// // GEMINI