test(dashboard): add autocomplete trigger/filter tests

dashboard/utils/autocomplete.js

@@ -0,0 +1,48 @@
+// Pure logic for autocomplete trigger detection and skill filtering.
+// Extracted from SimpleInput.js for testability.
+
+/**
+ * Detect if cursor is at a trigger position for autocomplete.
+ * Returns trigger info object or null.
+ */
+export function getTriggerInfo(value, cursorPos, autocompleteConfig) {
+  if (!autocompleteConfig) return null;
+
+  const { trigger } = autocompleteConfig;
+
+  // Find the start of the current "word" (after last whitespace before cursor)
+  let wordStart = cursorPos;
+  while (wordStart > 0 && !/\s/.test(value[wordStart - 1])) {
+    wordStart--;
+  }
+
+  // Check if word starts with this agent's trigger character
+  if (value[wordStart] === trigger) {
+    return {
+      trigger,
+      filterText: value.slice(wordStart + 1, cursorPos).toLowerCase(),
+      replaceStart: wordStart,
+      replaceEnd: cursorPos,
+    };
+  }
+
+  return null;
+}
+
+/**
+ * Filter and sort skills based on trigger info.
+ * Returns sorted array of matching skills.
+ */
+export function filteredSkills(autocompleteConfig, triggerInfo) {
+  if (!autocompleteConfig || !triggerInfo) return [];
+
+  const { skills } = autocompleteConfig;
+  const { filterText } = triggerInfo;
+
+  let filtered = filterText
+    ? skills.filter(s => s.name.toLowerCase().includes(filterText))
+    : skills.slice();
+
+  // Server pre-sorts, but re-sort after filtering for stability
+  return filtered.sort((a, b) => a.name.localeCompare(b.name));
+}