Update default models to newer versions (#31415)

Follow up to: https://github.com/zed-industries/zed/pull/31209
Changes default models across multiple providers:
- Zed.dev Default Models in settings: claude-3-7-sonnet-latest →
claude-4-sonnet-latest
- Bedrock Default Model: Claude 3.5 Sonnet v2 → Claude Sonnet 4
- Google AI Default Fast Model: Gemini 1.5 Flash → Gemini 2.0 Flash

Release Notes:

- N/A

docs/src/ai/configuration.md

@@ -152,8 +152,8 @@ You can configure a model to use [extended thinking](https://docs.anthropic.com/
 
 ```json
 {
-  "name": "claude-3-7-sonnet-latest",
-  "display_name": "claude-3-7-sonnet-thinking",
+  "name": "claude-4-sonnet-latest",
+  "display_name": "claude-4-sonnet-thinking",
   "max_tokens": 200000,
   "mode": {
     "type": "thinking",
@@ -455,7 +455,7 @@ Where `some-provider` can be any of the following values: `anthropic`, `google`,
 
 ### Default Model {#default-model}
 
-Zed's hosted LLM service sets `claude-3-7-sonnet-latest` as the default model.
+Zed's hosted LLM service sets `claude-4-sonnet-latest` as the default model.
 However, you can change it either via the model dropdown in the Agent Panel's bottom-right corner or by manually editing the `default_model` object in your settings:
 
 ```json
@@ -488,7 +488,7 @@ Example configuration:
     "version": "2",
     "default_model": {
       "provider": "zed.dev",
-      "model": "claude-3-7-sonnet"
+      "model": "claude-4-sonnet"
     },
     "inline_assistant_model": {
       "provider": "anthropic",
@@ -520,7 +520,7 @@ One with Claude 3.7 Sonnet, and one with GPT-4o.
   "agent": {
     "default_model": {
       "provider": "zed.dev",
-      "model": "claude-3-7-sonnet"
+      "model": "claude-4-sonnet"
     },
     "inline_alternatives": [
       {

docs/src/ai/temperature.md

@@ -16,7 +16,7 @@ Zed's settings allow you to specify a custom temperature for a provider and/or m
       // To set parameters for a specific provider and model:
       {
         "provider": "zed.dev",
-        "model": "claude-3-7-sonnet-latest",
+        "model": "claude-4-sonnet",
         "temperature": 1.0
       }
     ],

docs/src/configuring-zed.md

@@ -3287,11 +3287,11 @@ Run the `theme selector: toggle` action in the command palette to see a current
   "default_view": "thread",
   "default_model": {
     "provider": "zed.dev",
-    "model": "claude-3-7-sonnet-latest"
+    "model": "claude-4-sonnet"
   },
   "editor_model": {
     "provider": "zed.dev",
-    "model": "claude-3-7-sonnet-latest"
+    "model": "claude-4-sonnet"
   },
   "single_file_review": true,
 }