File-type icon colors with Plain/Multi setting (multi default)

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

src/shared/types.ts

@@ -55,6 +55,8 @@ export interface AppSettings {
 	theme: "system" | "light" | "dark";
 	/** Accent tone for chrome and selection tint; graphite = neutral zinc. */
 	accent: AccentTone;
+	/** File-list icons: plain neutral glyphs, or per-category glyphs and colors. */
+	iconColors: "plain" | "multi";
 	speedUnit: "MBps" | "Mbps";
 	/** Font size of the path bar and file list. */
 	textSize: "compact" | "default" | "large";
@@ -73,6 +75,7 @@ export interface AppSettings {
 export const DEFAULT_SETTINGS: AppSettings = {
 	theme: "system",
 	accent: "indigo",
+	iconColors: "multi",
 	speedUnit: "MBps",
 	textSize: "default",
 	transferMode: "single",