Add project staffing endpoints and project detail Kanban UI

frontend/src/components/ui/badge.tsx

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+import * as React from "react";
+import { cva, type VariantProps } from "class-variance-authority";
+
+import { cn } from "@/lib/utils";
+
+const badgeVariants = cva(
+  "inline-flex items-center rounded-full border px-2.5 py-0.5 text-xs font-semibold transition-colors",
+  {
+    variants: {
+      variant: {
+        default: "border-transparent bg-primary text-primary-foreground",
+        secondary: "border-transparent bg-secondary text-secondary-foreground",
+        outline: "text-foreground",
+      },
+    },
+    defaultVariants: {
+      variant: "default",
+    },
+  },
+);
+
+export interface BadgeProps
+  extends React.HTMLAttributes<HTMLDivElement>,
+    VariantProps<typeof badgeVariants> {}
+
+function Badge({ className, variant, ...props }: BadgeProps) {
+  return (
+    <div className={cn(badgeVariants({ variant }), className)} {...props} />
+  );
+}
+
+export { Badge, badgeVariants };

frontend/src/components/ui/input.tsx

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+import * as React from "react";
+
+import { cn } from "@/lib/utils";
+
+export type InputProps = React.InputHTMLAttributes<HTMLInputElement>
+
+const Input = React.forwardRef<HTMLInputElement, InputProps>(
+  ({ className, type, ...props }, ref) => {
+    return (
+      <input
+        type={type}
+        className={cn(
+          "flex h-10 w-full rounded-md border border-input bg-background px-3 py-2 text-sm ring-offset-background file:border-0 file:bg-transparent file:text-sm file:font-medium placeholder:text-muted-foreground focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-ring focus-visible:ring-offset-2 disabled:cursor-not-allowed disabled:opacity-50",
+          className,
+        )}
+        ref={ref}
+        {...props}
+      />
+    );
+  },
+);
+Input.displayName = "Input";
+
+export { Input };

frontend/src/components/ui/label.tsx

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+import * as React from "react";
+
+import { cn } from "@/lib/utils";
+
+const Label = React.forwardRef<
+  HTMLLabelElement,
+  React.LabelHTMLAttributes<HTMLLabelElement>
+>(({ className, ...props }, ref) => (
+  <label
+    ref={ref}
+    className={cn(
+      "text-sm font-medium leading-none peer-disabled:cursor-not-allowed peer-disabled:opacity-70",
+      className,
+    )}
+    {...props}
+  />
+));
+Label.displayName = "Label";
+
+export { Label };

frontend/src/components/ui/select.tsx

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+import * as React from "react";
+
+import { cn } from "@/lib/utils";
+
+export type SelectProps = React.SelectHTMLAttributes<HTMLSelectElement>
+
+const Select = React.forwardRef<HTMLSelectElement, SelectProps>(
+  ({ className, children, ...props }, ref) => (
+    <select
+      ref={ref}
+      className={cn(
+        "flex h-10 w-full rounded-md border border-input bg-background px-3 py-2 text-sm ring-offset-background focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-ring focus-visible:ring-offset-2 disabled:cursor-not-allowed disabled:opacity-50",
+        className,
+      )}
+      {...props}
+    >
+      {children}
+    </select>
+  ),
+);
+Select.displayName = "Select";
+
+export { Select };

frontend/src/components/ui/textarea.tsx

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+import * as React from "react";
+
+import { cn } from "@/lib/utils";
+
+export type TextareaProps = React.TextareaHTMLAttributes<HTMLTextAreaElement>
+
+const Textarea = React.forwardRef<HTMLTextAreaElement, TextareaProps>(
+  ({ className, ...props }, ref) => {
+    return (
+      <textarea
+        className={cn(
+          "flex min-h-[80px] w-full rounded-md border border-input bg-background px-3 py-2 text-sm ring-offset-background placeholder:text-muted-foreground focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-ring focus-visible:ring-offset-2 disabled:cursor-not-allowed disabled:opacity-50",
+          className,
+        )}
+        ref={ref}
+        {...props}
+      />
+    );
+  },
+);
+Textarea.displayName = "Textarea";
+
+export { Textarea };