refactor(@angular/build): use boundary resolution for sourcemap generation in oxc transform

Generating high-resolution sourcemap tokens for every character with hires: true produces substantially larger intermediate decoded mappings and increases peak memory consumption during sourcemap remapping.

Using hires: 'boundary' generates tokens only at identifier and word boundaries. This significantly reduces decoded sourcemap memory footprint and remapping time while retaining full debugging accuracy.

Author: clydin

packages/angular/build/src/tools/oxc/oxc-transform.ts

@@ -737,7 +737,7 @@ export function transform(filename: string, code: string, options: OxcTransformO
 
   let map: DecodedSourceMap | undefined;
   if (options.sourcemap) {
-    const rawMap = source.generateDecodedMap({ hires: true, source: filename });
+    const rawMap = source.generateDecodedMap({ hires: 'boundary', source: filename });
     map = { ...rawMap, version: 3 };
   }