feat: add support for .al (AL Language) file extension with fallback chunking

- Added "al" to the extensions array in tree-sitter index
- Added ".al" to fallbackExtensions for length-based chunking
- Enables AL Language (Dynamics 365 Business Central) file support

Fixes #8596

src/services/code-index/shared/supported-extensions.ts

@@ -22,6 +22,7 @@ export const fallbackExtensions = [
 	".vb", // Visual Basic .NET - no dedicated WASM parser
 	".scala", // Scala - uses fallback chunking instead of Lua query workaround
 	".swift", // Swift - uses fallback chunking due to parser instability
+	".al", // AL Language (Dynamics 365 Business Central) - no dedicated WASM parser
 ]
 
 /**

src/services/tree-sitter/index.ts

@@ -91,6 +91,8 @@ const extensions = [
 	"erb",
 	// Visual Basic .NET
 	"vb",
+	// AL Language
+	"al",
 ].map((e) => `.${e}`)
 
 export { extensions }