refactor: isolate Map Source controls and selection lifecycle

src/mapStackChips.test.mjs

@@ -347,26 +347,22 @@ test('the Visual Presets tray owns Map Source and the retired left panel is abse
   assert.match(panels, /event\.key !== 'Escape'[\s\S]*?disclosure\?\.focus/);
   assert.match(ui, /querySelector\('\.map-stack-chip\.active'\)\s*\|\| panel\.querySelector\('\.map-stack-chip'\)/);
 
-  assert.match(
-    ui,
-    /renderMapStackChips\(this\._mapStackChips, this\.mapStackController\.getStacks\(\), \{[\s\S]*?onSelect: \(stackId\) => \{ this\._setMapStack\(stackId\); \}/,
-    'chips must dispatch through the same _setMapStack path the dropdown used',
-  );
-  assert.match(
-    ui,
-    /_renderMapStackState\(state\) \{[\s\S]*?syncMapStackChips\(this\._mapStackChips, state\.activeId\)/,
-    'the active chip must be re-synced from controller state',
-  );
-  assert.match(
-    ui,
-    /window\.addEventListener\('gev:map-stack-changed', this\._mapStackChangeHandler\)/,
-    'provider-driven fallback must re-sync the UI without a user click',
-  );
-  assert.match(
-    ui,
-    /window\.removeEventListener\('gev:map-stack-changed', this\._mapStackChangeHandler\)/,
-    'the provider-driven state listener must be released with StyleManager',
-  );
+  const controls = readFileSync(new URL('./ui/mapSourceControls.js', import.meta.url), 'utf8');
+  assert.match(ui, /return this\._mapSourceControls\.select\(stackId, \{ syncShare \}\)/,
+    'the application action uses the component selection path');
+  assert.match(controls, /onSelect: [\s\S]*?select\(id\)/,
+    'chip clicks use the same component selection path');
+  assert.match(controls, /await controller\.setStack\(stackId\)/,
+    'selection still delegates source loading to the map controller');
+  assert.match(controls, /render\(controller\.getState\(\)\)/,
+    'the active chip is re-synced from actual controller state');
+  assert.match(ui, /window\.addEventListener\('gev:map-stack-changed', onChange\)/,
+    'provider-driven fallback reaches the component without a user click');
+  assert.match(ui, /window\.removeEventListener\('gev:map-stack-changed', onChange\)/,
+    'the provider-driven subscription has an explicit remover');
+  assert.match(controls, /unsubscribe\?\.\(\)/,
+    'component destruction releases its subscription');
+
 });
 
 test('Esri fallbacks report and attribute the imagery source actually rendered', () => {