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/styles/main.css

@@ -1,20 +1,131 @@
 @import "./fonts.css";
+@import "./tokens.css";
 
 :root {
+  /* Surface & Background */
   --bg: #f8fafc;
   --surface: #ffffff;
+  --surface-subtle: #f1f5f9;
+  --surface-hover: #f8fafc;
+
+  /* Typography & Foreground */
+  --font: "IRANSans", Tahoma, sans-serif;
   --ink: #0f172a;
+  --ink-secondary: #334155;
   --muted: #64748b;
+  --muted-light: #94a3b8;
   --line: #e2e8f0;
+  --line-light: #f1f5f9;
+  --line-strong: #cbd5e1;
+
+  /* Accent / Primary (Teal) */
   --accent: #14b8a6;
+  --accent-hover: #0d9488;
   --accent-deep: #0f766e;
   --accent-soft: #ccfbf1;
+  --accent-subtle: #f0fdfa;
+  --accent-contrast: #ffffff;
+
+  /* Semantics */
   --danger: #b42318;
-  --shadow: 0 8px 24px rgba(15, 23, 42, 0.06);
+  --danger-hover: #991b1b;
+  --danger-soft: #fee2e2;
+  --danger-deep: #7f1d1d;
+
+  --success: #10b981;
+  --success-soft: #d1fae5;
+  --success-deep: #047857;
+
+  --warning: #f59e0b;
+  --warning-soft: #fef3c7;
+  --warning-deep: #b45309;
+
+  --info: #0284c7;
+  --info-soft: #e0f2fe;
+  --info-deep: #0369a1;
+
+  /* Typography Scale */
+  --fs-xs: 0.75rem;    /* 12px */
+  --fs-sm: 0.8125rem;  /* 13px */
+  --fs-base: 0.875rem; /* 14px */
+  --fs-md: 0.9375rem;  /* 15px */
+  --fs-lg: 1.0625rem;  /* 17px */
+  --fs-xl: 1.25rem;    /* 20px */
+  --fs-2xl: 1.5rem;    /* 24px */
+  --fs-3xl: 1.75rem;   /* 28px */
+
+  --fw-normal: 400;
+  --fw-medium: 500;
+  --fw-semibold: 600;
+  --fw-bold: 700;
+  --fw-extrabold: 700;
+
+  --lh-tight: 1.25;
+  --lh-normal: 1.5;
+  --lh-relaxed: 1.625;
+
+  /* Spacing Scale */
+  --sp-1: 0.25rem; /* 4px */
+  --sp-2: 0.5rem;  /* 8px */
+  --sp-3: 0.75rem; /* 12px */
+  --sp-4: 1rem;    /* 16px */
+  --sp-5: 1.25rem; /* 20px */
+  --sp-6: 1.5rem;  /* 24px */
+  --sp-8: 2rem;    /* 32px */
+  --sp-10: 2.5rem; /* 40px */
+
+  /* Radius - Single Source of Truth (Globally 10px as requested) */
   --radius: 10px;
+  --radius-xs: var(--radius);
+  --radius-sm: var(--radius);
+  --radius-md: var(--radius);
+  --radius-lg: var(--radius);
+  --radius-xl: var(--radius);
+  --radius-2xl: var(--radius);
+  --radius-full: 9999px;
+
+  /* Control Dimensions */
+  --control-h-sm: 30px;
   --control-h: 36px;
-  --pad-modal: 24px;
-  --font: "IRANSans", Tahoma, sans-serif;
+  --control-h-md: 36px;
+  --control-h-lg: 42px;
+  --pad-modal: 16px;
+
+  /* Shadows */
+  --shadow-xs: 0 1px 2px rgba(15, 23, 42, 0.05);
+  --shadow-sm: 0 1px 3px rgba(15, 23, 42, 0.08), 0 1px 2px rgba(15, 23, 42, 0.04);
+  --shadow: 0 8px 24px rgba(15, 23, 42, 0.06);
+  --shadow-md: 0 4px 12px rgba(15, 23, 42, 0.08);
+  --shadow-lg: 0 12px 32px rgba(15, 23, 42, 0.12);
+  --shadow-xl: 0 20px 48px rgba(15, 23, 42, 0.16);
+
+  /* Transitions */
+  --transition-fast: 150ms ease;
+  --transition-normal: 200ms ease;
+
+  /* Z-index */
+  --z-dropdown: 50;
+  --z-sticky: 60;
+  --z-modal-backdrop: 80;
+  --z-modal: 90;
+  --z-toast: 100;
+  /* Compatibility aliases for legacy views */
+  --color-border: var(--line);
+  --color-border-light: var(--line-light);
+  --color-text: var(--ink);
+  --color-text-primary: var(--ink);
+  --color-text-secondary: var(--ink-secondary);
+  --color-text-muted: var(--muted);
+  --color-text-emphasis: var(--ink);
+  --color-surface: var(--surface);
+  --color-surface-sunken: var(--surface-subtle);
+  --color-primary: var(--accent);
+  --color-primary-dark: var(--accent-deep);
+  --color-primary-light: var(--accent-soft);
+  --color-primary-surface: var(--accent-subtle);
+  --color-danger: var(--danger);
+  --color-danger-surface: var(--danger-soft);
+  --color-warning: var(--warning);
 }
 
 * {
@@ -64,16 +175,20 @@ textarea {
 .btn {
   border: 0;
   border-radius: var(--radius);
+  height: var(--control-h);
   min-height: var(--control-h);
-  padding: 0 1rem;
+  padding: 0 0.85rem;
   cursor: pointer;
   background: var(--accent);
   color: white;
   font-weight: 600;
+  font-size: var(--fs-sm);
   display: inline-flex;
   align-items: center;
   justify-content: center;
   gap: 0.35rem;
+  box-sizing: border-box;
+  transition: background var(--transition-fast), border-color var(--transition-fast), opacity var(--transition-fast);
 }
 
 .btn:disabled {