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/activities/ActivityPostponeSheet.vue

@@ -274,8 +274,8 @@ onBeforeUnmount(() => {
 }
 
 .titles h2 {
-  font-size: 1.02rem;
-  font-weight: 800;
+  font-size: 16px;
+  font-weight: 500;
   color: #0f172a;
 }
 
@@ -319,7 +319,7 @@ onBeforeUnmount(() => {
   min-height: 72px;
   padding: 0.7rem 0.9rem;
   border: 1px solid #e8eef3;
-  border-radius: 16px;
+  border-radius: var(--radius);
   background: #fff;
   font: inherit;
   text-align: start;
@@ -340,7 +340,7 @@ onBeforeUnmount(() => {
 .label,
 .copy strong {
   font-size: 0.95rem;
-  font-weight: 800;
+  font-weight: 600;
   color: #0f172a;
 }
 
@@ -365,7 +365,7 @@ onBeforeUnmount(() => {
 .ico-box {
   width: 40px;
   height: 40px;
-  border-radius: 10px;
+  border-radius: var(--radius);
   background: #e6f7f4;
   color: #0d9488;
   display: grid;
@@ -375,13 +375,13 @@ onBeforeUnmount(() => {
 .when {
   color: #0d9488;
   font-size: 0.74rem;
-  font-weight: 800;
+  font-weight: 600;
   white-space: nowrap;
 }
 
 .custom-box {
   border: 1px solid #e8eef3;
-  border-radius: 16px;
+  border-radius: var(--radius);
   padding: 0.85rem 0.9rem;
   display: grid;
   gap: 0.55rem;
@@ -419,7 +419,7 @@ onBeforeUnmount(() => {
   align-items: flex-start;
   gap: 0.55rem;
   padding: 0.85rem 0.9rem;
-  border-radius: 14px;
+  border-radius: var(--radius);
   background: #f8fafc;
   color: #475569;
   font-size: 0.8rem;
@@ -452,7 +452,7 @@ onBeforeUnmount(() => {
     position: relative;
     max-width: 480px;
     height: min(92dvh, 860px);
-    border-radius: 22px;
+    border-radius: var(--radius, 10px);
     box-shadow: 0 28px 70px rgba(15, 23, 42, 0.22);
   }
 }