[FEATURE] Option to disable automatic session renaming in VS Code extension

Description

The VS Code extension automatically renames/retitles sessions in the conversation history sidebar. This appears to happen on extension restart (e.g., after reloading extensions). There is currently no setting to disable this behavior.

Request

Add a setting like claudeCode.autoRenameSession (default true) that allows users to disable automatic session renaming, so manually set session names are preserved across extension restarts.

Current behavior

• Sessions get auto-renamed after restarting extensions
• No way to prevent this — manual renames get overwritten

Expected behavior

• A setting to opt out of automatic session renaming
• Manually renamed sessions should persist and not be overwritten