Add package.json catalog support for npm completions and hover

Extend the npm extension to recognize the `catalog` section in
package.json, enabling IntelliSense completions, version suggestions,
and hover information for packages listed under the catalog key.
This supports the catalog feature used by pnpm, bun, and yarn for
centralizing dependency versions in monorepos.

Fixes #294609

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: yogeshwaran-c

extensions/npm/src/features/packageJSONContribution.ts

@@ -70,7 +70,7 @@ export class PackageJSONContribution implements IJSONContribution {
 			return null;
 		}
 
-		if ((location.matches(['dependencies']) || location.matches(['devDependencies']) || location.matches(['optionalDependencies']) || location.matches(['peerDependencies']))) {
+		if ((location.matches(['dependencies']) || location.matches(['devDependencies']) || location.matches(['optionalDependencies']) || location.matches(['peerDependencies']) || location.matches(['catalog']))) {
 			let queryUrl: string;
 			if (currentWord.length > 0) {
 				if (currentWord[0] === '@') {
@@ -184,7 +184,7 @@ export class PackageJSONContribution implements IJSONContribution {
 			return null;
 		}
 
-		if ((location.matches(['dependencies', '*']) || location.matches(['devDependencies', '*']) || location.matches(['optionalDependencies', '*']) || location.matches(['peerDependencies', '*']))) {
+		if ((location.matches(['dependencies', '*']) || location.matches(['devDependencies', '*']) || location.matches(['optionalDependencies', '*']) || location.matches(['peerDependencies', '*']) || location.matches(['catalog', '*']))) {
 			const currentKey = location.path[location.path.length - 1];
 			if (typeof currentKey === 'string') {
 				const info = await this.fetchPackageInfo(currentKey, resource);
@@ -347,7 +347,7 @@ export class PackageJSONContribution implements IJSONContribution {
 		if (!this.isEnabled()) {
 			return null;
 		}
-		if ((location.matches(['dependencies', '*']) || location.matches(['devDependencies', '*']) || location.matches(['optionalDependencies', '*']) || location.matches(['peerDependencies', '*']))) {
+		if ((location.matches(['dependencies', '*']) || location.matches(['devDependencies', '*']) || location.matches(['optionalDependencies', '*']) || location.matches(['peerDependencies', '*']) || location.matches(['catalog', '*']))) {
 			const pack = location.path[location.path.length - 1];
 			if (typeof pack === 'string') {
 				return this.fetchPackageInfo(pack, resource).then(info => {