feat: add Biome configuration to downgrade noExplicitAny to warning

Created biome.json to configure Biome linter to treat noExplicitAny as a
warning instead of an error. This allows necessary any types in polymorphic
components while still encouraging type safety elsewhere.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

biome.json

@@ -0,0 +1,29 @@
+{
+	"$schema": "https://biomejs.dev/schemas/1.9.4/schema.json",
+	"vcs": {
+		"enabled": true,
+		"clientKind": "git",
+		"useIgnoreFile": true
+	},
+	"files": {
+		"ignoreUnknown": false,
+		"ignore": [".next", "dist", ".turbo", "node_modules", "storybook-static"]
+	},
+	"formatter": {
+		"enabled": true,
+		"formatWithErrors": false,
+		"indentStyle": "tab",
+		"indentWidth": 2,
+		"lineWidth": 100,
+		"lineEnding": "lf"
+	},
+	"linter": {
+		"enabled": true,
+		"rules": {
+			"recommended": true,
+			"suspicious": {
+				"noExplicitAny": "warn"
+			}
+		}
+	}
+}