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/auth/AuthBrandPanel.vue

@@ -79,7 +79,7 @@ withDefaults(
 .brand-copy strong {
   font-size: 1.2rem;
   color: #0f172a;
-  font-weight: 800;
+  font-weight: 600;
 }
 
 .brand-copy span {
@@ -117,7 +117,7 @@ withDefaults(
   aspect-ratio: 1.35;
   background: rgba(255, 255, 255, 0.88);
   border: 1px solid rgba(148, 163, 184, 0.35);
-  border-radius: 18px;
+  border-radius: var(--radius);
   box-shadow: 0 18px 40px rgba(15, 23, 42, 0.1);
   padding: 1rem;
   backdrop-filter: blur(6px);
@@ -150,7 +150,7 @@ withDefaults(
 
 .chart-line {
   height: 54px;
-  border-radius: 12px;
+  border-radius: var(--radius);
   background:
     linear-gradient(180deg, transparent 55%, rgba(13, 148, 136, 0.12) 55%),
     radial-gradient(circle at 20% 60%, #14b8a6 3px, transparent 4px),
@@ -184,7 +184,7 @@ withDefaults(
   position: absolute;
   width: 42px;
   height: 42px;
-  border-radius: 14px;
+  border-radius: var(--radius);
   background: #fff;
   box-shadow: 0 10px 24px rgba(15, 23, 42, 0.1);
 }