docs: Update release notes for version 3.18 to include Codebase Indexing image

Author: hannesrudolph

docs/update-notes/v3.18.3.mdx

@@ -5,6 +5,8 @@ This release introduces experimental codebase indexing with semantic search, enh
 ## Codebase Indexing (Experimental)
 We've introduced a powerful new **experimental** [Codebase Indexing](/features/experimental/codebase-indexing) feature that enables semantic search across your entire project using AI embeddings. Remember, this is **disabled by default** and requires additional setup (enable in Settings (⚙️) > "Experimental").
 
+<img src="/img/codebase-indexing/codebase-indexing.png" alt="Codebase Indexing Settings" width="600" />
+
 Key capabilities:
 *   **Semantic Code Search**: Find relevant code using natural language queries instead of exact keyword matches
 *   **AI-Powered Understanding**: The new [`codebase_search`](/advanced-usage/available-tools/codebase-search) tool understands code meaning and relationships

docs/update-notes/v3.18.mdx

@@ -5,6 +5,8 @@ This release introduces advanced AI models with enhanced reasoning capabilities,
 ## Codebase Indexing (Experimental)
 Our new **experimental** [Codebase Indexing](/features/experimental/codebase-indexing) feature enables semantic search across your entire project using AI embeddings. Remember, this is **disabled by default** and requires additional setup (enable in Settings (⚙️) > "Experimental").
 
+<img src="/img/codebase-indexing/codebase-indexing.png" alt="Codebase Indexing Settings" width="600" />
+
 Key capabilities:
 *   **Semantic Code Search**: Find relevant code using natural language queries instead of exact keyword matches
 *   **AI-Powered Understanding**: The new [`codebase_search`](/advanced-usage/available-tools/codebase-search) tool understands code meaning and relationships