Add "Prepare for Claude" feature for study guide generation

Adds a buildClaudePrompt() utility that formats the completed study project
(scripture, notes, Greek word research) into a structured prompt ready to
paste into Claude. A "Prepare for Claude" button in the header copies it to
the clipboard and shows a brief confirmation. Button is disabled until at
least one chunk exists.

https://claude.ai/code/session_01C4T3bYHR2svLq7JVcxKJ6Y

src/App.jsx

@@ -198,6 +198,69 @@ export function renderVerseContent(content) {
   return '';
 }
 
+export function buildClaudePrompt(project) {
+  const header = `I've prepared a Bible study on ${project.book} ${project.chapter} (${project.translation}) and need your help turning my notes into a polished study guide.
+
+Below is my work organised by passage chunk, including my study notes and Greek word research. Please create a clear, structured study guide that:
+- Synthesises my notes into coherent teaching points
+- Naturally integrates the Greek word insights
+- Includes 2–3 reflection questions per chunk
+- Preserves the passage-by-passage structure
+
+---
+
+PROJECT: ${project.title}
+TRANSLATION: ${project.translation}
+PASSAGE: ${project.book} ${project.chapter}
+
+`;
+
+  const chunks = project.chunks.map((chunk, index) => {
+    const ref = chunk.startVerse === chunk.endVerse
+      ? `${project.book} ${project.chapter}:${chunk.startVerse}`
+      : `${project.book} ${project.chapter}:${chunk.startVerse}–${chunk.endVerse}`;
+
+    const verses = project.verses
+      .filter((v) => v.number >= chunk.startVerse && v.number <= chunk.endVerse)
+      .map((v) => `${v.number} ${v.text}`)
+      .join('\n');
+
+    const notes = chunk.notes.trim() || 'No notes.';
+
+    const greekWords = chunk.greekWords.length === 0
+      ? 'None.'
+      : chunk.greekWords.map((word) => {
+          const summary = [
+            word.strongNumber,
+            word.lexeme,
+            word.transliteration && `(${word.transliteration})`,
+            word.partOfSpeech,
+            word.shortDefinition,
+          ].filter(Boolean).join(' | ');
+          const definition = word.definitionHtml
+            ? `\n  ${htmlToPlainText(word.definitionHtml)}`
+            : '';
+          return `• ${summary}${definition}`;
+        }).join('\n');
+
+    return `===
+
+CHUNK ${index + 1} — ${ref}
+
+Scripture:
+${verses}
+
+My Notes:
+${notes}
+
+Greek Words:
+${greekWords}
+`;
+  }).join('\n');
+
+  return header + chunks;
+}
+
 export function parseBibleChapter(data) {
   if (data?.verses && Array.isArray(data.verses)) {
     return data.verses.map((verse) => ({
@@ -671,6 +734,15 @@ const App = () => {
     URL.revokeObjectURL(url);
   };
 
+  const copyForClaude = () => {
+    if (!project) return;
+    const prompt = buildClaudePrompt(project);
+    navigator.clipboard.writeText(prompt).then(() => {
+      setSaveStatus('Copied for Claude!');
+      window.setTimeout(() => setSaveStatus(''), 2000);
+    });
+  };
+
   const verseLabel = (start, end) => (start === end ? `${start}` : `${start}-${end}`);
 
   return (
@@ -710,6 +782,14 @@ const App = () => {
             )}
             {project && (
               <div className="flex flex-wrap items-center gap-3">
+                <button
+                  type="button"
+                  onClick={copyForClaude}
+                  disabled={project.chunks.length === 0}
+                  className="rounded-md bg-violet-500 px-4 py-2 text-sm font-medium text-white shadow-sm transition hover:bg-violet-400 disabled:cursor-not-allowed disabled:bg-slate-500"
+                >
+                  Prepare for Claude
+                </button>
                 <button
                   type="button"
                   onClick={exportChapter}

src/utils.test.js

@@ -7,6 +7,7 @@ import {
   parseBibleChapter,
   wordTableHtml,
   buildExportHtml,
+  buildClaudePrompt,
   createParagraphsFromText,
 } from './App.jsx';
 
@@ -388,3 +389,87 @@ describe('createParagraphsFromText', () => {
     expect(result).toHaveLength(2);
   });
 });
+
+// ---------------------------------------------------------------------------
+// buildClaudePrompt
+// ---------------------------------------------------------------------------
+describe('buildClaudePrompt', () => {
+  test('includes project title, translation, and passage', () => {
+    const prompt = buildClaudePrompt(baseProject);
+    expect(prompt).toContain('Titus 1 Study');
+    expect(prompt).toContain('BSB');
+    expect(prompt).toContain('Titus 1');
+  });
+
+  test('includes scripture verse text for the chunk range', () => {
+    const prompt = buildClaudePrompt(baseProject);
+    expect(prompt).toContain('Paul, a servant of God.');
+    expect(prompt).toContain('In hope of eternal life.');
+  });
+
+  test('includes study notes', () => {
+    expect(buildClaudePrompt(baseProject)).toContain('Key observations.');
+  });
+
+  test('includes Greek word data', () => {
+    const prompt = buildClaudePrompt(baseProject);
+    expect(prompt).toContain('G1401');
+    expect(prompt).toContain('δοῦλος');
+    expect(prompt).toContain('doulos');
+    expect(prompt).toContain('a slave');
+  });
+
+  test('numbers each chunk sequentially', () => {
+    const multiChunkProject = {
+      ...baseProject,
+      chunks: [
+        { ...baseProject.chunks[0], id: 'c1', startVerse: 1, endVerse: 1 },
+        { ...baseProject.chunks[0], id: 'c2', startVerse: 2, endVerse: 2, notes: 'Second chunk notes.', greekWords: [] },
+      ],
+    };
+    const prompt = buildClaudePrompt(multiChunkProject);
+    expect(prompt).toContain('CHUNK 1');
+    expect(prompt).toContain('CHUNK 2');
+  });
+
+  test('formats a single-verse reference without a dash', () => {
+    const project = {
+      ...baseProject,
+      chunks: [{ ...baseProject.chunks[0], startVerse: 1, endVerse: 1 }],
+    };
+    const prompt = buildClaudePrompt(project);
+    expect(prompt).toContain('Titus 1:1');
+    expect(prompt).not.toContain('Titus 1:1–1');
+  });
+
+  test('formats a multi-verse reference with an en-dash', () => {
+    const prompt = buildClaudePrompt(baseProject);
+    expect(prompt).toContain('Titus 1:1–2');
+  });
+
+  test('shows "No notes." when chunk notes are empty', () => {
+    const project = { ...baseProject, chunks: [{ ...baseProject.chunks[0], notes: '' }] };
+    expect(buildClaudePrompt(project)).toContain('No notes.');
+  });
+
+  test('shows "None." when chunk has no Greek words', () => {
+    const project = { ...baseProject, chunks: [{ ...baseProject.chunks[0], greekWords: [] }] };
+    expect(buildClaudePrompt(project)).toContain('None.');
+  });
+
+  test('only includes verses within the chunk range', () => {
+    const project = {
+      ...baseProject,
+      verses: [
+        { number: 1, text: 'Verse one.' },
+        { number: 2, text: 'Verse two.' },
+        { number: 3, text: 'Verse three.' },
+      ],
+      chunks: [{ ...baseProject.chunks[0], startVerse: 2, endVerse: 2, greekWords: [] }],
+    };
+    const prompt = buildClaudePrompt(project);
+    expect(prompt).toContain('Verse two.');
+    expect(prompt).not.toContain('Verse one.');
+    expect(prompt).not.toContain('Verse three.');
+  });
+});