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/EntityTimeline.vue

@@ -289,7 +289,7 @@ onMounted(load);
 .composer input {
   width: 100%;
   border: 1px solid var(--line);
-  border-radius: 12px;
+  border-radius: var(--radius);
   padding: 0.7rem 0.85rem;
   background: #fff;
 }
@@ -316,7 +316,7 @@ onMounted(load);
   gap: 0.75rem;
   align-items: flex-start;
   border: 1px solid var(--line);
-  border-radius: 12px;
+  border-radius: var(--radius);
   padding: 0.75rem 0.85rem;
   background: #fbfcfb;
 }