Unify Glass Stage navigation and page controls with Now Playing

frontend/glass-controls.test.js

@@ -0,0 +1,9 @@
+const test=require('node:test'),assert=require('node:assert/strict');
+const {leadingGlyph}=require('./glass-controls.js');
+test('glass icon substitution preserves leading whitespace and remaining labels',()=>{
+ assert.deepEqual(leadingGlyph('  ⬇ Save'),{kind:'save',original:'  ⬇',rest:' Save'});
+ assert.deepEqual(leadingGlyph('⚙️ Settings'),{kind:'settings',original:'⚙️',rest:' Settings'});
+ assert.equal(leadingGlyph('A song with 🔍 in its title'),null);
+ assert.equal(leadingGlyph('Clear all'),null);
+ assert.equal(leadingGlyph('⏸').kind,'pause');
+});