fix: Restrict Emmet commands to Emmet-supported languages only

[Copilot]

Emmet commands (e.g. editor.emmet.action.toggleComment) were executing on arbitrary file types like Java, applying HTML/CSS comment syntax where it doesn't belong.

Changes

• extensions/emmet/src/util.ts — validate(): Added an Emmet language check using the existing getEmmetMode() infrastructure. Commands now bail out early for unsupported languages.

const mappedModes = getMappingForIncludedLanguages();
const excludedLanguages = vscode.workspace.getConfiguration('emmet').get<string[]>('excludeLanguages') ?? [];
if (!getEmmetMode(editor.document.languageId, mappedModes, excludedLanguages)) {
    return false;
}

Since all Emmet actions call validate() at entry, this single change gates all commands. emmet.includeLanguages and emmet.excludeLanguages user settings are respected.

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