feat(ui): standardize design system, modals, sidebar, and form inputs

- Implement unified design system tokens, 10px radius, and IRANSans typography
- Modernize sidebar with Gemini-style collapsed expander, square 1:1 items, and elevated profile flyout
- Standardize all modal dialogs with 16px padding, fixed header/footer, 16px medium title, and sticky bottom actions
- Refactor DealFormView and CustomFieldsSection with standard UiField, UiInput, and UiSelect components
- Add draggable bottom-left QuickCreate floating action button

apps/web/src/components/AskMentoPanel.vue

@@ -90,7 +90,7 @@ form {
   gap: 0.45rem;
   background: #fff;
   border: 1px solid #e2e8f0;
-  border-radius: 14px;
+  border-radius: var(--radius);
   padding: 0.35rem 0.4rem 0.35rem 0.7rem;
 }
 
@@ -110,7 +110,7 @@ input {
 
 button {
   border: 0;
-  border-radius: 10px;
+  border-radius: var(--radius);
   background: #14b8a6;
   color: #fff;
   font: inherit;
@@ -126,7 +126,7 @@ button:disabled {
 
 .answer {
   background: #f0fdfa;
-  border-radius: 12px;
+  border-radius: var(--radius);
   padding: 0.7rem 0.85rem;
 }