Fix 500 error, add Address/Contact placeholders, and enhance Person activity view

- Fixed broken import path in /core dashboard
- Simplified core layout data requirements to prevent crashes
- Implemented V3 CRUD and Dexie tables for Addresses and Contacts
- Created placeholder management pages for /core/addresses and /core/contacts
- Added 'Linked Activity & Content' section to Person detail page to show related events and posts

src/routes/core/contacts/+page.svelte

@@ -0,0 +1,91 @@
+<script lang="ts">
+    import { onMount } from 'svelte';
+    import { ae_loc, ae_api, slct } from '$lib/stores/ae_stores';
+    import { goto } from '$app/navigation';
+    import { Phone, Plus, Search, Mail, User } from 'lucide-svelte';
+    import { load_ae_obj_li__contact } from '$lib/ae_core/ae_core__contact';
+
+    let contact_li: any[] = $state([]);
+    let loading = $state(true);
+
+    async function load_contacts() {
+        if (!$ae_loc.account_id) return;
+        loading = true;
+        contact_li = await load_ae_obj_li__contact({
+            api_cfg: $ae_api,
+            for_obj_id: $ae_loc.account_id,
+            enabled: 'all',
+            log_lvl: 1
+        });
+        loading = false;
+    }
+
+    onMount(() => {
+        if (!$ae_loc.manager_access) {
+            goto('/core');
+            return;
+        }
+        load_contacts();
+    });
+</script>
+
+<div class="container mx-auto p-4 space-y-6">
+    <header class="flex justify-between items-center">
+        <div class="flex items-center gap-2">
+            <Phone size={24} />
+            <h1 class="h2">Contact Management</h1>
+        </div>
+        <button class="btn variant-filled-primary" disabled>
+            <Plus size={16} class="mr-2" /> Add Contact
+        </button>
+    </header>
+
+    {#if loading}
+        <div class="placeholder animate-pulse h-64 w-full"></div>
+    {:else if contact_li.length === 0}
+        <div class="card p-8 text-center variant-soft">
+            <p class="opacity-60">No contacts found for this account.</p>
+        </div>
+    {:else}
+        <div class="table-container">
+            <table class="table table-hover">
+                <thead>
+                    <tr>
+                        <th>Name</th>
+                        <th>Email</th>
+                        <th>Phone</th>
+                        <th>Status</th>
+                        <th class="text-right">Actions</th>
+                    </tr>
+                </thead>
+                <tbody>
+                    {#each contact_li as con}
+                        <tr>
+                            <td>
+                                <div class="flex items-center gap-2">
+                                    <User size={14} class="opacity-60" />
+                                    {con.name || '--'}
+                                </div>
+                            </td>
+                            <td>
+                                <div class="flex items-center gap-2">
+                                    <Mail size={14} class="opacity-60" />
+                                    {con.email || '--'}
+                                </div>
+                            </td>
+                            <td>{con.phone || '--'}</td>
+                            <td>
+                                <span class="badge {con.enable ? 'variant-filled-success' : 'variant-filled-error'}">
+                                    {con.enable ? 'Enabled' : 'Disabled'}
+                                </span>
+                            </td>
+                            <td class="text-right">
+                                <button class="btn btn-sm variant-soft-primary" disabled>Manage</button>
+                            </td>
+                        </tr>
+                    {/each}
+                </tbody>
+            </table>
+        </div>
+    {/if}
+</div>