fix(core): modern Svelte 5 cleanup — Dexie .get() bug, typed API calls, inline confirms

- person_view.svelte: fix liveQuery using .get() (primary key, never set by V3)
  → .where('person_id').equals().first()
- people/[person_id]: same Dexie .get() fix for lq__person_obj
- person_view.svelte: replace 4x generic api.update_ae_obj → core_func.update_ae_obj__person
  (removes unused api import)
- Replace all browser confirm()/alert() dialogs (9 occurrences, 6 files) with
  inline two-click confirm state pattern (confirm_action = $state<string|null>)
  Affected: users, accounts, contacts, addresses, people, sites
- Bootstrap doc: add Dexie .get() trap to Section 5 and Mistake #8

src/routes/core/contacts/[contact_id]/+page.svelte

@@ -32,6 +32,7 @@ let contact_id = $derived($page.params.contact_id ?? '');
 let contact: any = $state(null);
 let loading = $state(true);
 let is_editing = $state(false);
+let confirm_action = $state<string | null>(null);
 
 async function load_data() {
     loading = true;
@@ -52,7 +53,11 @@ onMount(() => {
 });
 
 async function handle_delete() {
-    if (!confirm('Permanently delete this contact?')) return;
+    if (confirm_action !== 'delete_contact') {
+        confirm_action = 'delete_contact';
+        return;
+    }
+    confirm_action = null;
     await delete_ae_obj_id__contact({
         api_cfg: $ae_api,
         contact_id,
@@ -87,7 +92,7 @@ async function handle_delete() {
                 </div>
             </div>
         </div>
-        <div class="flex gap-2">
+        <div class="flex flex-wrap gap-2">
             <button
                 class="btn btn-sm preset-tonal-secondary font-bold shadow-sm"
                 onclick={() => (is_editing = !is_editing)}
@@ -98,12 +103,27 @@ async function handle_delete() {
                     <Edit size={16} class="mr-2" /> Edit Mode
                 {/if}
             </button>
-            <button
-                class="btn btn-sm preset-tonal-error font-bold shadow-sm"
-                onclick={handle_delete}
-                disabled={loading}>
-                <Trash2 size={16} class="mr-2" /> Delete
-            </button>
+            {#if confirm_action === 'delete_contact'}
+                <span class="self-center text-sm font-bold text-red-600">Delete this contact?</span>
+                <button
+                    class="btn btn-sm preset-filled-error font-bold shadow-sm"
+                    onclick={handle_delete}
+                    disabled={loading}>
+                    <Trash2 size={16} class="mr-2" /> Confirm Delete
+                </button>
+                <button
+                    class="btn btn-sm preset-tonal-surface"
+                    onclick={() => (confirm_action = null)}>
+                    Cancel
+                </button>
+            {:else}
+                <button
+                    class="btn btn-sm preset-tonal-error font-bold shadow-sm"
+                    onclick={handle_delete}
+                    disabled={loading}>
+                    <Trash2 size={16} class="mr-2" /> Delete
+                </button>
+            {/if}
         </div>
     </header>