Fix passkey login tracking, add email opt-out UI guards, and add Quick/Full quote mode toggle

- PasskeyController: set LastLoginDate on passkey sign-in so Company Health
  and audit pages show accurate last-login times (was always showing 'Never')
- Jobs/Index status modal: disable 'Notify customer' email toggle and show
  warning when customer has notifications turned off; CustomerNotifyByEmail
  added to JobListDto + JobProfile mapping + data-customer-notify attribute
- Quotes/Create: disable 'Send quote via email' checkbox with 'Notifications
  off' badge when selected customer has email opt-out; ViewBag.CustomerEmailOptOutIds
  added alongside existing CustomerTaxExemptIds pattern
- Quotes/Create: Quick Quote / Full Quote segmented toggle at top of form;
  hides non-essential fields (dates, notes, tags, oven, discount, photos) in
  Quick mode; selection persisted in localStorage
- InvoicesController Send action: improved error logging and user-facing
  warning when PDF generation or email dispatch fails after status is saved
- item-wizard.js: guard item restoration with try/catch; ensure writeHiddenFields
  always runs on form submit via capture-phase listener
- Help docs and AI knowledge base updated for all new features

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/PowderCoating.Web/wwwroot/js/item-wizard.js

@@ -65,11 +65,23 @@ document.addEventListener('DOMContentLoaded', () => {
     // Restore items from server round-trip (validation failure re-render)
     const existingEl = document.getElementById('existingItemsData');
     if (existingEl) {
-        quoteItems = JSON.parse(existingEl.textContent);
-        renderAllCards();
-        writeHiddenFields();
-        window.scrollTo({ top: 0, behavior: 'instant' });
-        scheduleAutoPricing();
+        try {
+            quoteItems = JSON.parse(existingEl.textContent);
+            renderAllCards();
+            writeHiddenFields();
+            window.scrollTo({ top: 0, behavior: 'instant' });
+            scheduleAutoPricing();
+        } catch (err) {
+            console.error('item-wizard: failed to restore items from server model:', err);
+        }
+    }
+
+    // Guarantee hidden fields are always written on form submission, even if the wizard
+    // was never interacted with (e.g. validation round-trip with pre-existing items).
+    const hfc = document.getElementById('hiddenFieldsContainer');
+    const ownerForm = hfc?.closest('form');
+    if (ownerForm) {
+        ownerForm.addEventListener('submit', writeHiddenFields, { capture: true });
     }
 
     // Close any open powder combobox dropdown when clicking outside it