Feat: Frontend app shell

Frontend/src/components/shell/TopBar/TopBar.tsx

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+// Path: Frontend/src/components/shell/TopBar/TopBar.tsx
+
+import { For, type JSX } from "solid-js";
+import type { Theme } from "../../../helpers/theme";
+import { ChevronDown } from "../../../lib/icons";
+import { topBarActions } from "../data/shell.data";
+import styles from "./TopBar.module.scss";
+
+type TopBarProps = {
+	theme: Theme;
+	onToggleTheme: VoidFunction;
+};
+
+export const TopBar = (props: TopBarProps): JSX.Element => {
+	return (
+		<header class={styles.topBar}>
+			<div class={styles.identity}>
+				<span class={styles.eyebrow}>Moku Work</span>
+				<div class={styles.title}>
+					<strong>Workspace Shell</strong>
+					<span class={styles.context}>Moku / Product</span>
+					<ChevronDown size={16} strokeWidth={2} />
+				</div>
+			</div>
+
+			<button class={styles.themeButton} type="button" onClick={props.onToggleTheme}>
+				<span class={styles.themeLabel}>{props.theme === "dark" ? "Dark" : "Light"}</span>
+			</button>
+
+			<div class={styles.actions}>
+				<For each={topBarActions}>
+					{(item): JSX.Element => {
+						const Icon = item.icon;
+
+						return (
+							<button class={styles.actionButton} type="button" aria-label={item.label} title={item.label}>
+								<Icon size={18} strokeWidth={2} />
+							</button>
+						);
+					}}
+				</For>
+			</div>
+		</header>
+	);
+};