chore: add Biome for formatting and linting (#116)

- Add Biome as formatter and linter (replaces Prettier)
- Configure Husky + lint-staged for pre-commit hooks
- Add VS Code settings for format on save
- Ignore components/ui/ (shadcn generated code)
- Remove semicolons, use 4-space indent
- Reformat all files to new style

components/error-toast.tsx

@@ -1,19 +1,19 @@
-"use client";
+"use client"
 
-import React from "react";
+import type React from "react"
 
 interface ErrorToastProps {
-    message: React.ReactNode;
-    onDismiss: () => void;
+    message: React.ReactNode
+    onDismiss: () => void
 }
 
 export function ErrorToast({ message, onDismiss }: ErrorToastProps) {
     const handleKeyDown = (e: React.KeyboardEvent) => {
         if (e.key === "Enter" || e.key === " " || e.key === "Escape") {
-            e.preventDefault();
-            onDismiss();
+            e.preventDefault()
+            onDismiss()
         }
-    };
+    }
 
     return (
         <div
@@ -25,7 +25,12 @@ export function ErrorToast({ message, onDismiss }: ErrorToastProps) {
             className="flex items-center gap-3 bg-card border border-border/50 px-4 py-3 rounded-xl shadow-sm cursor-pointer hover:bg-muted/50 focus:outline-none focus:ring-2 focus:ring-primary/50 transition-colors"
         >
             <div className="flex items-center justify-center w-8 h-8 rounded-full bg-destructive/10 flex-shrink-0">
-                <svg className="w-4 h-4 text-destructive" viewBox="0 0 20 20" fill="currentColor" aria-hidden="true">
+                <svg
+                    className="w-4 h-4 text-destructive"
+                    viewBox="0 0 20 20"
+                    fill="currentColor"
+                    aria-hidden="true"
+                >
                     <path
                         fillRule="evenodd"
                         d="M4.293 4.293a1 1 0 011.414 0L10 8.586l4.293-4.293a1 1 0 111.414 1.414L11.414 10l4.293 4.293a1 1 0 01-1.414 1.414L10 11.414l-4.293 4.293a1 1 0 01-1.414-1.414L8.586 10 4.293 5.707a1 1 0 010-1.414z"
@@ -35,5 +40,5 @@ export function ErrorToast({ message, onDismiss }: ErrorToastProps) {
             </div>
             <span className="text-sm text-foreground">{message}</span>
         </div>
-    );
+    )
 }