Improve teacher content editor mobile workspace

frontend/src/lib/actions/preserveFocus.ts

@@ -0,0 +1,27 @@
+/**
+ * Svelte action that prevents an element from stealing focus from the
+ * currently-focused text editor when tapped/clicked.
+ *
+ * Used on workspace tool buttons (quick-tools-rail, tabs, save/publish)
+ * so interacting with the workspace does not blur the inline editor.
+ *
+ * Note: we deliberately do NOT preventDefault on touchstart, because doing
+ * so suppresses the subsequent `click` event on mobile browsers. mousedown
+ * (which fires as a compatibility event after touchend on touch devices)
+ * is sufficient to block the focus change while still letting click fire.
+ */
+export function preserveFocus(node: HTMLElement) {
+	function onDown(e: Event) {
+		e.preventDefault();
+	}
+
+	node.addEventListener('pointerdown', onDown, { passive: false });
+	node.addEventListener('mousedown', onDown, { passive: false });
+
+	return {
+		destroy() {
+			node.removeEventListener('pointerdown', onDown);
+			node.removeEventListener('mousedown', onDown);
+		}
+	};
+}

frontend/src/lib/components/CodeEditor.svelte

@@ -8,10 +8,21 @@
 		readonly?: boolean;
 		noPaste?: boolean;
 		storageKey?: string;
+		initialCursorPos?: number;
+		initialLine?: number;
 		onchange?: (value: string) => void;
 	}
 
-	let { code = '', language = 'c', readonly = false, noPaste = false, storageKey, onchange }: Props = $props();
+	let {
+		code = '',
+		language = 'c',
+		readonly = false,
+		noPaste = false,
+		storageKey,
+		initialCursorPos,
+		initialLine,
+		onchange
+	}: Props = $props();
 
 	let container: HTMLDivElement;
 	let view: any;
@@ -205,6 +216,12 @@
 			}),
 			parent: container,
 		});
+
+		if (initialCursorPos !== undefined) {
+			setCursorPos(initialCursorPos);
+		} else if (initialLine !== undefined) {
+			scrollToLine(initialLine);
+		}
 	}
 
 	function setupNoPasteListeners() {
@@ -317,6 +334,40 @@
 	export function getCode(): string {
 		return view?.state.doc.toString() ?? code;
 	}
+
+	/** Set cursor to an exact character position and scroll it into view. */
+	export function setCursorPos(pos: number) {
+		if (!view || !CM) return;
+		const docLen = view.state.doc.length;
+		const safePos = Math.max(0, Math.min(pos, docLen));
+		view.dispatch({
+			selection: { anchor: safePos, head: safePos },
+			effects: CM.EditorView.scrollIntoView(safePos, { y: 'center' }),
+		});
+		view.focus();
+	}
+
+	/** Scroll editor to a specific 1-indexed line and position cursor there. */
+	export function scrollToLine(lineNumber: number) {
+		if (!view || !CM) return;
+		try {
+			const totalLines = view.state.doc.lines;
+			const targetLine = Math.max(1, Math.min(lineNumber, totalLines));
+			const line = view.state.doc.line(targetLine);
+			view.dispatch({
+				selection: { anchor: line.from, head: line.from },
+				effects: CM.EditorView.scrollIntoView(line.from, { y: 'center' }),
+			});
+			view.focus();
+		} catch (e) {
+			// line out of range — ignore
+		}
+	}
+
+	/** Focus the editor */
+	export function focus() {
+		view?.focus();
+	}
 </script>
 <div class="editor-wrapper" class:no-paste={noPaste} bind:this={container}>
 	{#if !ready}

frontend/src/lib/components/ContentInlineEditor.svelte

@@ -0,0 +1,227 @@
+<script lang="ts">
+	import { onMount } from 'svelte';
+	import CodeEditor from '$components/CodeEditor.svelte';
+
+	interface Props {
+		code?: string;
+		fileName?: string;
+		initialCursorPos?: number;
+		initialLine?: number;
+		onchange: (value: string) => void;
+		onclose: () => void;
+	}
+
+	let {
+		code = '',
+		fileName = '',
+		initialCursorPos,
+		initialLine,
+		onchange,
+		onclose
+	}: Props = $props();
+
+	let containerEl: HTMLDivElement;
+	let editorRef = $state<any>(null);
+
+	onMount(() => {
+		// Handle Escape key to return to preview
+		const handleKeyDown = (e: KeyboardEvent) => {
+			if (e.key === 'Escape') {
+				e.preventDefault();
+				e.stopPropagation();
+				onclose();
+			} else if ((e.ctrlKey || e.metaKey) && e.key.toLowerCase() === 'e') {
+				e.preventDefault();
+				e.stopPropagation();
+				onclose();
+			}
+		};
+
+		// Handle click outside editor container to return to preview.
+		// Clicks inside the workspace (editor-area) or on focus-preserving
+		// controls must NOT close the editor — otherwise picking a tool
+		// from the workspace would drop focus / exit edit mode.
+		const handleDocumentClick = (e: MouseEvent) => {
+			if (!containerEl) return;
+			const target = e.target as Node | null;
+			if (!target) return;
+			const el = target instanceof Element ? target : target.parentElement;
+			if (el && (el.closest('.editor-area') || el.closest('[data-preserve-editor-focus]'))) return;
+			if (!containerEl.contains(target)) {
+				onclose();
+			}
+		};
+
+		window.addEventListener('keydown', handleKeyDown, true);
+		// Delay attaching click-outside listener to avoid triggering on the click that opened the editor
+		const timer = setTimeout(() => {
+			window.addEventListener('click', handleDocumentClick, true);
+		}, 100);
+
+		return () => {
+			clearTimeout(timer);
+			window.removeEventListener('keydown', handleKeyDown, true);
+			window.removeEventListener('click', handleDocumentClick, true);
+		};
+	});
+
+	export function focus() {
+		editorRef?.focus();
+	}
+
+	export function scrollToLine(line: number) {
+		editorRef?.scrollToLine(line);
+	}
+
+	export function setCursorPos(pos: number) {
+		editorRef?.setCursorPos(pos);
+	}
+
+	export function insertAtCursor(text: string) {
+		editorRef?.insertAtCursor(text);
+	}
+
+	export function setCode(newCode: string) {
+		editorRef?.setCode(newCode);
+	}
+</script>
+
+<div class="inline-editor-container" bind:this={containerEl}>
+	<div class="inline-editor-header">
+		<div class="header-left">
+			<span class="mode-badge">✏️ Mode Edit</span>
+			{#if fileName}
+				<span class="file-title">{fileName}</span>
+			{/if}
+			<span class="help-text">Tekan <kbd>Esc</kbd> atau klik di luar untuk preview</span>
+		</div>
+		<div class="header-right">
+			<button type="button" class="btn-preview-mode" onclick={onclose} title="Kembali ke preview (Esc)">
+				👁️ Kembali ke Preview
+			</button>
+		</div>
+	</div>
+	<div class="inline-editor-body">
+		<CodeEditor
+			bind:this={editorRef}
+			{code}
+			language="markdown"
+			{initialCursorPos}
+			{initialLine}
+			{onchange}
+		/>
+	</div>
+</div>
+
+<style>
+	.inline-editor-container {
+		display: flex;
+		flex-direction: column;
+		height: 100%;
+		min-height: 500px;
+		background: var(--color-bg);
+		border-radius: var(--radius);
+		overflow: hidden;
+		border: 1px solid var(--color-primary, #339af0);
+		box-shadow: 0 0 0 1px var(--color-primary, #339af0);
+	}
+
+	.inline-editor-header {
+		display: flex;
+		align-items: center;
+		justify-content: space-between;
+		gap: 0.5rem;
+		padding: 0.4rem 0.75rem;
+		background: var(--color-bg-secondary);
+		border-bottom: 1px solid var(--color-border);
+		flex-shrink: 0;
+	}
+
+	.header-left {
+		display: flex;
+		align-items: center;
+		gap: 0.5rem;
+		min-width: 0;
+		overflow: hidden;
+	}
+
+	.mode-badge {
+		font-size: 0.75rem;
+		font-weight: 700;
+		color: var(--color-primary, #339af0);
+		background: color-mix(in srgb, var(--color-primary, #339af0) 15%, transparent);
+		padding: 2px 6px;
+		border-radius: 4px;
+		white-space: nowrap;
+	}
+
+	.file-title {
+		font-size: 0.8rem;
+		font-weight: 600;
+		color: var(--color-text);
+		overflow: hidden;
+		text-overflow: ellipsis;
+		white-space: nowrap;
+	}
+
+	.help-text {
+		font-size: 0.75rem;
+		color: var(--color-text-muted);
+		white-space: nowrap;
+	}
+
+	.help-text kbd {
+		background: var(--color-bg);
+		border: 1px solid var(--color-border);
+		border-radius: 3px;
+		padding: 1px 4px;
+		font-size: 0.7rem;
+		font-family: inherit;
+	}
+
+	.btn-preview-mode {
+		display: inline-flex;
+		align-items: center;
+		gap: 4px;
+		background: var(--color-bg);
+		border: 1px solid var(--color-border);
+		color: var(--color-text);
+		border-radius: 4px;
+		padding: 0.25rem 0.6rem;
+		font-size: 0.78rem;
+		font-weight: 500;
+		cursor: pointer;
+		transition: all 0.15s;
+		white-space: nowrap;
+	}
+
+	.btn-preview-mode:hover {
+		background: var(--color-border);
+		color: var(--color-primary, #339af0);
+	}
+
+	.inline-editor-body {
+		flex: 1;
+		display: flex;
+		flex-direction: column;
+		min-height: 0;
+		overflow: hidden;
+	}
+
+	.inline-editor-body :global(.editor-wrapper) {
+		flex: 1;
+		min-height: 0;
+		border: none;
+		border-radius: 0;
+	}
+
+	.inline-editor-body :global(.cm-editor) {
+		height: 100% !important;
+		min-height: 0 !important;
+		max-height: none !important;
+	}
+
+	.inline-editor-body :global(.cm-scroller) {
+		height: 100%;
+	}
+</style>

frontend/src/lib/components/LessonContentView.svelte

@@ -6,20 +6,116 @@
 	import { renderFlowchartEmbeds } from '$actions/renderFlowchartEmbeds';
 	import { autoRenderMath } from '$lib/actions/renderMath';
 
+	export interface ClickTextDetail {
+		word: string;
+		snippet: string;
+		blockText: string;
+		blockIndex: number;
+		totalBlocks: number;
+		event: MouseEvent;
+	}
+
 	interface Props {
 		lessonHtml: string;
 		exerciseHtml?: string;
 		quizData?: unknown[];
 		slides?: string[];
 		activeTabs?: string[];
+		clickable?: boolean;
+		onclicktext?: (detail: ClickTextDetail) => void;
 	}
 
-	let { lessonHtml, exerciseHtml = '', quizData = [], slides = [], activeTabs = [] }: Props = $props();
+	let {
+		lessonHtml,
+		exerciseHtml = '',
+		quizData = [],
+		slides = [],
+		activeTabs = [],
+		clickable = false,
+		onclicktext
+	}: Props = $props();
 
 	let contentEl = $state<HTMLElement | null>(null);
 	// Plain variable (not $state) to avoid infinite reactivity loops when mounting inside $effect
 	let slideComponent: ReturnType<typeof mount> | null = null;
 
+	function handleContentClick(event: MouseEvent) {
+		if (!clickable || !onclicktext) return;
+
+		// Don't trigger when clicking buttons, links, controls, or interactive embeds
+		const targetEl = event.target as HTMLElement | null;
+		if (targetEl?.closest('button, a, input, select, textarea, .try-btn, iframe, [data-interactive]')) {
+			return;
+		}
+
+		let textNode: Node | null = null;
+		let offset = 0;
+
+		const doc = document as any;
+		if (doc.caretPositionFromPoint) {
+			const pos = doc.caretPositionFromPoint(event.clientX, event.clientY);
+			if (pos) {
+				textNode = pos.offsetNode;
+				offset = pos.offset;
+			}
+		} else if (doc.caretRangeFromPoint) {
+			const range = doc.caretRangeFromPoint(event.clientX, event.clientY);
+			if (range) {
+				textNode = range.startContainer;
+				offset = range.startOffset;
+			}
+		}
+
+		let word = '';
+		let snippet = '';
+		if (textNode) {
+			const fullText = textNode.textContent || '';
+			let start = offset;
+			while (start > 0 && /\S/.test(fullText[start - 1])) {
+				start--;
+			}
+			let end = offset;
+			while (end < fullText.length && /\S/.test(fullText[end])) {
+				end++;
+			}
+			word = fullText.slice(start, end).trim();
+			const snippetStart = Math.max(0, start - 25);
+			const snippetEnd = Math.min(fullText.length, end + 25);
+			snippet = fullText.slice(snippetStart, snippetEnd).trim();
+		}
+
+		let blockEl: Element | null = null;
+		let curr: Node | null = textNode || targetEl;
+		while (curr && curr !== contentEl) {
+			if (curr.nodeType === Node.ELEMENT_NODE) {
+				const tag = (curr as Element).tagName.toLowerCase();
+				if (['p', 'h1', 'h2', 'h3', 'h4', 'h5', 'h6', 'li', 'blockquote', 'pre', 'tr', 'td', 'th', 'summary'].includes(tag)) {
+					blockEl = curr as Element;
+					break;
+				}
+			}
+			curr = curr.parentNode;
+		}
+
+		const blockText = blockEl ? (blockEl.textContent || '').trim() : '';
+		let blockIndex = -1;
+		let totalBlocks = 0;
+		if (blockEl && contentEl) {
+			const allBlocks = contentEl.querySelectorAll('p, h1, h2, h3, h4, h5, h6, li, blockquote, pre, tr');
+			totalBlocks = allBlocks.length;
+			blockIndex = Array.from(allBlocks).indexOf(blockEl);
+		}
+
+		onclicktext({
+			word,
+			snippet,
+			blockText,
+			blockIndex,
+			totalBlocks,
+			event
+		});
+	}
+
 	$effect(() => {
 		if (contentEl && lessonHtml) {
 			const currentSlides = slides;
@@ -72,7 +168,13 @@
 	});
 </script>
 
-<div class="lesson-content-view prose" bind:this={contentEl}>
+<!-- svelte-ignore a11y_no_static_element_interactions -->
+<div
+	class="lesson-content-view prose"
+	class:clickable
+	bind:this={contentEl}
+	onclick={handleContentClick}
+>
 	{@html lessonHtml}
 </div>
 
@@ -83,4 +185,28 @@
 		text-align: left;
 		max-width: 70ch;
 	}
+	.lesson-content-view.clickable {
+		cursor: text;
+	}
+	/* Match /lesson .prose typography (lesson.css) */
+	.lesson-content-view p {
+		margin-bottom: 1.5rem;
+	}
+	.lesson-content-view h2 {
+		font-size: 1.5rem;
+		margin-top: 3rem;
+		margin-bottom: 1.5rem;
+	}
+	.lesson-content-view h3 {
+		font-size: 1.25rem;
+		margin-top: 2rem;
+		margin-bottom: 1rem;
+	}
+	.lesson-content-view pre {
+		background: var(--color-bg-secondary);
+		padding: 0.75rem;
+		border-radius: var(--radius);
+		overflow-x: auto;
+		position: relative;
+	}
 </style>

frontend/src/lib/services/contentEditor.svelte.ts

@@ -22,7 +22,7 @@ export class ContentEditorManager {
 	previewLoading = $state(false);
 
 	// Mobile mode (replicated from LessonManager pattern)
-	mobileMode = $state<'hidden' | 'h30' | 'h50' | 'h70' | 'full'>('hidden');
+	mobileMode = $state<'hidden' | 'peek' | 'h30' | 'h50' | 'h70' | 'full'>('hidden');
 	isMobile = $state(false);
 
 	// Tab state — 'editor' | 'preview' | 'exercise' | 'quiz' | dynamic tabs from active_tabs ('c', 'python', 'circuit', 'velxio', 'flowchart')