Update documentation to reference Claude 4 Sonnet (#1209)

This PR updates the documentation to reference Claude 4 Sonnet instead
of Claude 3.7 in the following files:

- `docs/introduction/prompting.mdx`
- `docs/settings/model-configuration.mdx`

All references to Claude 3.7 have been updated to Claude 4 Sonnet to
reflect the current model being used by Codegen.

---

[💻 View my work](https://codegen.com/agent/trace/76434) • 👤 Initiated by
@kopekC • 💬 Initiated in
[#frontend](https://thecodegen.slack.com/archives/C06S0R2EULR/p1755557237694299?thread_ts=1755557145.380499&cid=C06S0R2EULR)
• [About Codegen](https://codegen.com)
[⛔ Remove Codegen from
PR](https://codegen.com/agent/trace/76434/remove-from-pr) • [🚫 Ban
action checks](https://codegen.com/agent/trace/76434/ban)

Co-authored-by: codegen-sh[bot] <131295404+codegen-sh[bot]@users.noreply.github.com>
Co-authored-by: Eduardo Pujol <[email protected]>

Author: codegen-sh[bot]

docs/introduction/prompting.mdx

@@ -8,7 +8,7 @@ iconType: "solid"
 To get the best results from Codegen, treat it like a skilled teammate: provide clear, specific instructions and sufficient context. Vague requests lead to ambiguous outcomes.
 
 <Tip>
-  Codegen is based on Anthropic's Claude 3.7. You can prompt it similarly to
+  Codegen is based on Anthropic's Claude 4 Sonnet. You can prompt it similarly to
   ChatGPT or other LLM-based assistants
 </Tip>
 

docs/settings/model-configuration.mdx

@@ -24,15 +24,15 @@ As shown in the UI, you can generally configure the following:
   - Anthropic
   - OpenAI
   - Google (Gemini)
-- **LLM Model:** Once a provider is selected, you can choose a specific model from that provider's offerings (e.g., Claude 3.7, GPT-4, Gemini Pro).
+- **LLM Model:** Once a provider is selected, you can choose a specific model from that provider's offerings (e.g., Claude 4 Sonnet, GPT-4, Gemini Pro).
 
 ## Model Recommendation
 
 <Warning>
   While Codegen provides access to a variety of models for experimentation and
-  specific use cases, **we highly encourage the use of Anthropic's Claude 3.7
-  (Haiku)**. Our internal testing and prompt engineering are heavily optimized
-  for Claude 3.7, and it consistently delivers the best performance,
+  specific use cases, **we highly encourage the use of Anthropic's Claude 4 Sonnet**. 
+  Our internal testing and prompt engineering are heavily optimized
+  for Claude 4 Sonnet, and it consistently delivers the best performance,
   reliability, and cost-effectiveness for most software engineering tasks
   undertaken by Codegen agents. Other models are made available primarily for
   users who are curious or have unique, pre-existing workflows.
@@ -47,7 +47,7 @@ For advanced users or those with specific enterprise agreements with LLM provide
 
 <Tip>
   Using the default Codegen-managed LLM configuration (especially with Claude
-  3.7) is recommended for most users to ensure optimal performance and to
+  4 Sonnet) is recommended for most users to ensure optimal performance and to
   benefit from our continuous prompt improvements.
 </Tip>