feat: expand AppSettings with appearance and board default fields

src/lib/schemas.ts

@@ -58,4 +58,8 @@ export const appSettingsSchema = z.object({
   theme: z.enum(["light", "dark", "system"]).default("system"),
   dataDirectory: z.string().nullable().default(null),
   recentBoardIds: z.array(z.string()).default([]),
+  accentColor: z.string().default("160"),
+  uiZoom: z.number().min(0.75).max(1.5).default(1),
+  density: z.enum(["compact", "comfortable", "spacious"]).default("comfortable"),
+  defaultColumnWidth: z.enum(["narrow", "standard", "wide"]).default("standard"),
 });

src/types/settings.ts

@@ -1,5 +1,11 @@
+import type { ColumnWidth } from "./board";
+
 export interface AppSettings {
   theme: "light" | "dark" | "system";
   dataDirectory: string | null;
   recentBoardIds: string[];
+  accentColor: string;
+  uiZoom: number;
+  density: "compact" | "comfortable" | "spacious";
+  defaultColumnWidth: ColumnWidth;
 }