Feat v0.2.3 sdk tasks (#7)

Co-authored-by: Jeffrey Smith <jasafpro@gmail.com>
Co-committed-by: Jeffrey Smith <jasafpro@gmail.com>

src/js/sw/sdk/slots.js

@@ -0,0 +1,77 @@
+// ==========================================
+// Switchboard Core — SDK: Slot System
+// ==========================================
+// Named shell regions where extensions inject UI.
+//
+// Factory: createSlots(emitFn)
+// ==========================================
+
+/**
+ * Create the slot registry.
+ *
+ * @param {Function} emitFn — events.emit for change notifications
+ * @returns {object} slots
+ */
+export function createSlots(emitFn) {
+    /** @type {Map<string, Array<{id:string, component:Function, priority:number}>>} */
+    const _registry = new Map();
+
+    function _sort(arr) {
+        arr.sort((a, b) => a.priority - b.priority);
+    }
+
+    return {
+        /**
+         * Register a component into a named slot.
+         * @param {string} name — slot name (e.g. 'toolbar', 'statusbar')
+         * @param {object} entry — { id, component, priority? }
+         * @returns {Function} unregister
+         */
+        register(name, { id, component, priority = 100 }) {
+            if (!_registry.has(name)) _registry.set(name, []);
+            const list = _registry.get(name);
+
+            // Prevent duplicate ids in same slot
+            const idx = list.findIndex(e => e.id === id);
+            if (idx !== -1) list.splice(idx, 1);
+
+            list.push({ id, component, priority });
+            _sort(list);
+
+            emitFn('slots.changed', { slot: name, action: 'register', id }, { localOnly: true });
+
+            return () => this.unregister(name, id);
+        },
+
+        /**
+         * Remove a component from a slot.
+         */
+        unregister(name, id) {
+            const list = _registry.get(name);
+            if (!list) return;
+            const idx = list.findIndex(e => e.id === id);
+            if (idx !== -1) {
+                list.splice(idx, 1);
+                if (list.length === 0) _registry.delete(name);
+                emitFn('slots.changed', { slot: name, action: 'unregister', id }, { localOnly: true });
+            }
+        },
+
+        /**
+         * Get sorted entries for a slot.
+         * @param {string} name
+         * @returns {Array<{id:string, component:Function, priority:number}>}
+         */
+        get(name) {
+            return _registry.get(name) || [];
+        },
+
+        /**
+         * List all slot names that have content.
+         * @returns {string[]}
+         */
+        names() {
+            return [..._registry.keys()];
+        },
+    };
+}