feat: recipient search

Signed-off-by: Sebastian <krupinski01@gmail.com>

src/stores/mailRecipientsStore.ts

@@ -0,0 +1,85 @@
+/**
+ * Recipients Store
+ */
+
+import { ref } from 'vue'
+import { defineStore } from 'pinia'
+import { recipientService } from '../services/recipientService'
+import type { MessageAddressInterface } from '@MailManager/types/message'
+
+/** Minimum characters before a lookup fires. */
+const MIN_QUERY_LENGTH = 3
+
+/** Debounce window for keystroke-driven searches. */
+const DEBOUNCE_MS = 250
+
+export const useRecipientLookupStore = defineStore('mailRecipientsStore', () => {
+  const suggestions = ref<MessageAddressInterface[]>([])
+  const searching = ref(false)
+
+  let debounceTimer: ReturnType<typeof setTimeout> | null = null
+  // Monotonic token so out-of-order/stale responses are discarded.
+  let requestToken = 0
+
+  function cancelPending() {
+    if (debounceTimer) {
+      clearTimeout(debounceTimer)
+      debounceTimer = null
+    }
+  }
+
+  /**
+   * Clear suggestions and cancel any in-flight lookup.
+   */
+  function clear() {
+    cancelPending()
+    requestToken++
+    suggestions.value = []
+    searching.value = false
+  }
+
+  /**
+   * Debounced contact search. Queries shorter than MIN_QUERY_LENGTH clear the
+   * suggestion list without hitting the backend.
+   */
+  function search(query: string) {
+    const trimmed = (query ?? '').trim()
+    cancelPending()
+
+    if (trimmed.length < MIN_QUERY_LENGTH) {
+      requestToken++
+      suggestions.value = []
+      searching.value = false
+      return
+    }
+
+    searching.value = true
+    const token = ++requestToken
+
+    debounceTimer = setTimeout(async () => {
+      try {
+        const matches = await recipientService.search(trimmed)
+        if (token !== requestToken) {
+          return
+        }
+        suggestions.value = matches
+      } catch (error: any) {
+        if (token === requestToken) {
+          suggestions.value = []
+        }
+        console.error('[Mail][Recipient Lookup] - Search failed:', error)
+      } finally {
+        if (token === requestToken) {
+          searching.value = false
+        }
+      }
+    }, DEBOUNCE_MS)
+  }
+
+  return {
+    suggestions,
+    searching,
+    search,
+    clear,
+  }
+})