refactor(ui): remove the map stack chip DOM builders

The dock renders the chips from the map source controls' published view,
so renderMapStackChips, syncMapStackChips and MAP_STACK_CHIP_CLASS have no
callers. Their tests now pin the chip models; the dock test keeps the
rendered chips' button type and native enablement.

src/mapStackChips.js

@@ -1,19 +1,18 @@
 // MAP STACK source chips — the always-visible replacement for the `<select>`
-// that used to sit in the Map Stack panel. One button per stack, rendered from
-// `MapStackController.getStacks()`. The approved sources below are
-// the whole shipped set; keeping the allowlist explicit means a stack added to
-// `MAP_STACKS` for another purpose cannot reach the tray until someone names it
-// here.
+// that used to sit in the Map Stack panel. One chip model per stack, from
+// `MapStackController.getStacks()`; the dock renders them. The approved sources
+// below are the whole shipped set; keeping the allowlist explicit means a stack
+// added to `MAP_STACKS` for another purpose cannot reach the tray until someone
+// names it here.
 //
-// The chips are a control SURFACE only: selecting one calls back into the same
-// `_setMapStack()` path the dropdown's `change` handler used, and the active
-// state is re-synced from controller state (never optimistically), so a failed
-// or superseded switch still leaves the truly-active stack lit.
+// The chips are a control SURFACE only: selecting one calls
+// `createMapSourceControls().select()`, the path `_setMapStack()` uses, and the
+// active state is re-synced from controller state (never optimistically), so a
+// failed or superseded switch still leaves the truly-active stack lit.
 
 import { keySetupRequirementEnvVars } from './keySetupCore.mjs';
 import { t } from './i18n/index.js';
 
-export const MAP_STACK_CHIP_CLASS = 'map-stack-chip';
 export const PRESENTED_MAP_STACK_IDS = Object.freeze([
   'photoreal',
   'bing-aerial',
@@ -78,100 +77,3 @@ export function mapStackChipModels(stacks, activeId) {
     .filter(Boolean)
     .map((stack) => mapStackChipModel(stack, activeId));
 }
-
-/**
- * Renders the chip row into `container`, replacing any previous chips.
- * @deprecated Core's dock renders the row from `createMapSourceControls()`'s
- *   published view; this DOM builder is no longer used by Core.
- * @param {HTMLElement} container - Row element.
- * @param {Array<object>} stacks - `MapStackController.getStacks()` output.
- * @param {object} [options]
- * @param {string|null} [options.activeId] - Currently active stack id.
- * @param {(stackId: string) => void} [options.onSelect] - Selection callback.
- * @param {Document} [options.doc] - Document override (tests).
- * @param {(element: HTMLElement, type: string, listener: Function) => void} [options.bind] - Listener owner override.
- * @returns {Array<object>} The rendered chip models.
- */
-export function renderMapStackChips(
-  container,
-  stacks,
-  {
-    activeId = null,
-    onSelect = null,
-    doc,
-    bind = (element, type, listener) =>
-      element.addEventListener(type, listener),
-  } = {},
-) {
-  if (!container) return [];
-  const ownerDoc = doc || container.ownerDocument || globalThis.document;
-  if (!ownerDoc?.createElement) return [];
-
-  container.innerHTML = '';
-  const models = mapStackChipModels(stacks, activeId);
-
-  for (const model of models) {
-    const chip = ownerDoc.createElement('button');
-    chip.type = 'button';
-    chip.className = [
-      MAP_STACK_CHIP_CLASS,
-      model.active ? 'active' : '',
-      model.available ? '' : 'unavailable',
-    ]
-      .filter(Boolean)
-      .join(' ');
-    chip.dataset.stackId = model.id;
-    chip.title = model.title;
-    chip.setAttribute('aria-pressed', String(model.active));
-    chip.setAttribute('aria-disabled', String(!model.available));
-    if (!model.available) {
-      chip.setAttribute(
-        'aria-label',
-        t('{label} unavailable: {hint}', {
-          label: model.label,
-          hint: model.unavailableHint,
-        }),
-      );
-    }
-
-    const label = ownerDoc.createElement('span');
-    label.className = 'map-stack-chip-label';
-    label.textContent = model.label;
-    chip.appendChild(label);
-
-    if (model.requirement) {
-      const requirement = ownerDoc.createElement('span');
-      requirement.className = 'map-stack-chip-req';
-      requirement.textContent = model.requirement;
-      chip.appendChild(requirement);
-    }
-
-    bind(chip, 'click', () => {
-      if (!model.available) return;
-      onSelect?.(model.id);
-    });
-    container.appendChild(chip);
-  }
-
-  return models;
-}
-
-/**
- * Re-points the active chip at controller state.
- * @deprecated Core's dock renders the active chip from the published view. Availability never changes at
- * runtime (it tracks the ion token), so only the active/pressed pair is synced.
- * @param {HTMLElement} container - Row element.
- * @param {string|null} activeId - Currently active stack id.
- * @returns {void}
- */
-export function syncMapStackChips(container, activeId) {
-  const chips = container?.children;
-  if (!chips) return;
-  for (const chip of Array.from(chips)) {
-    const stackId = chip?.dataset?.stackId;
-    if (!stackId) continue;
-    const active = stackId === activeId;
-    chip.classList?.toggle('active', active);
-    chip.setAttribute?.('aria-pressed', String(active));
-  }
-}