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/ui/index.ts

@@ -0,0 +1,15 @@
+export { default as UiButton } from './UiButton.vue';
+export { default as UiInput } from './UiInput.vue';
+export { default as UiTextarea } from './UiTextarea.vue';
+export { default as UiSelect } from './UiSelect.vue';
+export { default as UiField } from './UiField.vue';
+export { default as UiCard } from './UiCard.vue';
+export { default as UiModal } from './UiModal.vue';
+export { default as UiPageHeader } from './UiPageHeader.vue';
+export { default as UiBadge } from './UiBadge.vue';
+export { default as UiPagination } from './UiPagination.vue';
+export { default as UiEmptyState } from './UiEmptyState.vue';
+export { default as UiSearch } from './UiSearch.vue';
+export { default as UiFilterBar } from './UiFilterBar.vue';
+export { default as UiSegmented } from './UiSegmented.vue';
+export { default as UiChart, CHART_PALETTE, type UiChartOption } from './UiChart.vue';