feat: add configurable headers and instance branding (#6690)

packages/ui/src/components/corner-style-picker.tsx

@@ -0,0 +1,66 @@
+"use client";
+
+import { Box, SimpleGrid, Stack, Text } from "@mantine/core";
+
+import { SelectableCard } from "./selectable-card";
+
+export const cornerStyleValues = ["xs", "sm", "md", "lg", "xl"] as const;
+
+export type CornerStyle = (typeof cornerStyleValues)[number];
+
+interface CornerStylePickerProps {
+  label: string;
+  description?: string;
+  value: CornerStyle;
+  labels: Record<CornerStyle, string>;
+  onChange: (value: CornerStyle) => void;
+  compact?: boolean;
+}
+
+export const CornerStylePicker = ({
+  label,
+  description,
+  value,
+  labels,
+  onChange,
+  compact = false,
+}: CornerStylePickerProps) => {
+  const previewHeight = compact ? 24 : 34;
+
+  return (
+    <Box component="fieldset" m={0} p={0} style={{ border: 0, minWidth: 0 }}>
+      <Text component="legend" fw={500} size="sm" p={0}>
+        {label}
+      </Text>
+      <Stack gap="xs" mt={2}>
+        {description ? (
+          <Text size="sm" c="dimmed">
+            {description}
+          </Text>
+        ) : null}
+        <SimpleGrid cols={{ base: 3, xs: 5 }} spacing="xs">
+          {cornerStyleValues.map((cornerStyle) => (
+            <SelectableCard
+              key={cornerStyle}
+              selected={value === cornerStyle}
+              onClick={() => onChange(cornerStyle)}
+              radius={cornerStyle}
+              p="xs"
+              aria-label={labels[cornerStyle]}
+              style={compact ? { minHeight: "auto", height: "auto" } : undefined}
+            >
+              <Box
+                h={previewHeight}
+                bg="var(--mantine-color-default-hover)"
+                style={{ borderRadius: `var(--mantine-radius-${cornerStyle})` }}
+              />
+              <Text size="xs" ta="center" mt="xs">
+                {labels[cornerStyle]}
+              </Text>
+            </SelectableCard>
+          ))}
+        </SimpleGrid>
+      </Stack>
+    </Box>
+  );
+};

packages/ui/src/components/index.tsx

@@ -27,6 +27,8 @@ export { LanguageIcon } from "./language-icon";
 export { LanguageCombobox } from "./language-combobox";
 export { ColorSchemeCombobox } from "./color-scheme-combobox";
 export { BoardColorInput } from "./board-color-input";
+export { CornerStylePicker, cornerStyleValues } from "./corner-style-picker";
+export type { CornerStyle } from "./corner-style-picker";
 export { IntegrationMarquee } from "./integration-marquee";
 export { Link } from "./link";
 export {