Fix duplicate export declarations and migrate ContactsView with sub-components

- Remove duplicate NOTIFY_INVITE_MISSING and NOTIFY_INVITE_PROCESSING_ERROR exports
- Update InviteOneAcceptView.vue to use correct NOTIFY_INVITE_TRUNCATED_DATA constant
- Migrate ContactsView to PlatformServiceMixin and extract into modular sub-components
- Resolves TypeScript compilation errors preventing web build

src/components/ContactListHeader.vue

@@ -0,0 +1,75 @@
+<template>
+  <div class="flex justify-between">
+    <!-- Left side - Bulk selection controls -->
+    <div class="">
+      <div v-if="!showGiveNumbers" class="flex items-center">
+        <input
+          type="checkbox"
+          :checked="allContactsSelected"
+          class="align-middle ml-2 h-6 w-6"
+          data-testId="contactCheckAllTop"
+          @click="$emit('toggle-all-selection')"
+        />
+        <button
+          v-if="!showGiveNumbers"
+          :class="copyButtonClass"
+          :disabled="copyButtonDisabled"
+          data-testId="copySelectedContactsButtonTop"
+          @click="$emit('copy-selected')"
+        >
+          Copy
+        </button>
+        <font-awesome
+          icon="circle-info"
+          class="text-2xl text-blue-500 ml-2"
+          @click="$emit('show-copy-info')"
+        />
+      </div>
+    </div>
+
+    <!-- Right side - Action buttons -->
+    <div class="flex items-center gap-2">
+      <button
+        v-if="showGiveNumbers"
+        class="text-md bg-gradient-to-b shadow-[inset_0_-1px_0_0_rgba(0,0,0,0.5)] text-white px-3 py-1.5 rounded-md"
+        :class="giveAmountsButtonClass"
+        @click="$emit('toggle-give-totals')"
+      >
+        {{ giveAmountsButtonText }}
+        <font-awesome icon="left-right" class="fa-fw" />
+      </button>
+
+      <button
+        class="text-md bg-gradient-to-b from-slate-400 to-slate-700 shadow-[inset_0_-1px_0_0_rgba(0,0,0,0.5)] text-white px-3 py-1.5 rounded-md"
+        @click="$emit('toggle-show-actions')"
+      >
+        {{ showActionsButtonText }}
+      </button>
+    </div>
+  </div>
+</template>
+
+<script lang="ts">
+import { Component, Vue, Prop } from "vue-facing-decorator";
+
+/**
+ * ContactListHeader - Contact list header component
+ *
+ * Provides bulk selection controls and action buttons for the contact list.
+ * Handles copy operations and give amounts display toggles.
+ *
+ * @author Matthew Raymer
+ */
+@Component({
+  name: "ContactListHeader",
+})
+export default class ContactListHeader extends Vue {
+  @Prop({ required: true }) showGiveNumbers!: boolean;
+  @Prop({ required: true }) allContactsSelected!: boolean;
+  @Prop({ required: true }) copyButtonClass!: string;
+  @Prop({ required: true }) copyButtonDisabled!: boolean;
+  @Prop({ required: true }) giveAmountsButtonText!: string;
+  @Prop({ required: true }) showActionsButtonText!: string;
+  @Prop({ required: true }) giveAmountsButtonClass!: Record<string, boolean>;
+}
+</script>