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/accounts/[account_id]/+page.svelte

@@ -22,6 +22,8 @@ let account_id = $derived($page.params.account_id ?? '');
 let account: any = $state(null);
 let loading = $state(true);
 let saving = $state(false);
+let save_success = $state(false);
+let confirm_action = $state<string | null>(null);
 
 async function load_account() {
     loading = true;
@@ -59,13 +61,18 @@ async function handle_save() {
     });
 
     if (result) {
-        alert('Account updated successfully');
+        save_success = true;
+        setTimeout(() => (save_success = false), 2500);
     }
     saving = false;
 }
 
 async function handle_delete() {
-    if (!confirm('Are you sure you want to disable this account?')) return;
+    if (confirm_action !== 'disable_account') {
+        confirm_action = 'disable_account';
+        return;
+    }
+    confirm_action = null;
 
     const result = await delete_ae_obj_id__account({
         api_cfg: $ae_api,
@@ -98,13 +105,33 @@ async function handle_delete() {
                 </h1>
             </div>
         </div>
-        <div class="flex gap-2">
-            <button
-                class="btn btn-sm preset-filled-error font-bold shadow-lg"
-                onclick={handle_delete}
-                disabled={loading || saving}>
-                <Trash2 size={16} class="mr-2" /> Disable
-            </button>
+        <div class="flex items-center gap-2">
+            {#if confirm_action === 'disable_account'}
+                <span class="text-sm font-bold text-red-600">Disable this account?</span>
+                <button
+                    class="btn btn-sm preset-filled-error font-bold shadow-lg"
+                    onclick={handle_delete}
+                    disabled={loading || saving}>
+                    <Trash2 size={16} class="mr-2" /> Confirm Disable
+                </button>
+                <button
+                    class="btn btn-sm preset-tonal-surface"
+                    onclick={() => (confirm_action = null)}>
+                    Cancel
+                </button>
+            {:else}
+                <button
+                    class="btn btn-sm preset-filled-error font-bold shadow-lg"
+                    onclick={handle_delete}
+                    disabled={loading || saving}>
+                    <Trash2 size={16} class="mr-2" /> Disable
+                </button>
+            {/if}
+            {#if save_success}
+                <span class="flex items-center gap-1 text-sm font-bold text-green-600">
+                    <Info size={16} /> Saved
+                </span>
+            {/if}
             <button
                 class="btn btn-sm preset-filled-primary font-bold shadow-lg"
                 onclick={handle_save}