feat: implement comprehensive JavaScript functionality recovery using TDD

This commit implements 5 major JavaScript features that were lost during
refactoring, using systematic Test-Driven Development methodology:

**Core Features Implemented:**
- Advanced EditState enum with pending changes preservation
- Keyboard shortcuts (Ctrl+Enter accept, Escape cancel)
- Section splitting with dynamic heading detection
- Real-time status tracking with 2-second periodic updates
- Intelligent filename generation with 4-method fallback system

**Technical Improvements:**
- Comprehensive TDD test suites for all functionality
- Professional status panel with color-coded indicators
- Smart filename generation (options→title→URL→heading→timestamp)
- Event-driven architecture with custom event emission
- State preservation during editing transitions

**Files Added:**
- markitect/static/editor.js - Complete JavaScript functionality
- test_*.js - Comprehensive TDD test suites
- LOST_FUNCTIONALITY_ANALYSIS.md - Detailed feature comparison
- TEST_ENVIRONMENT.md - TDD setup documentation

**Updated Documentation:**
- TODO.md - Status tracking and progress documentation

All features are fully tested and integrated into the existing codebase.
The TDD approach proved highly effective for systematic functionality recovery.

🤖 Generated with [Claude Code](https://claude.ai/code)

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

test_get_all_sections.js

@@ -0,0 +1,82 @@
+#!/usr/bin/env node
+
+/**
+ * TDD Tests for getAllSections Method Recovery
+ */
+
+const { TestRunner } = require('./test_runner.js');
+const runner = new TestRunner();
+
+// Test getAllSections functionality
+runner.describe('SectionManager getAllSections method', () => {
+
+    runner.it('should have getAllSections method in SectionManager', async () => {
+        // Load editor
+        delete require.cache[require.resolve('/home/worsch/markitect_project/markitect/static/editor.js')];
+        require('/home/worsch/markitect_project/markitect/static/editor.js');
+
+        if (global.SectionManager) {
+            const manager = new global.SectionManager();
+            const hasGetAllSections = typeof manager.getAllSections === 'function';
+            runner.expect(hasGetAllSections).toBeTruthy();
+        }
+    });
+
+    runner.it('should return array of all sections', async () => {
+        if (global.SectionManager) {
+            const manager = new global.SectionManager();
+
+            // Create some test sections
+            const sections = manager.createSectionsFromMarkdown('# Test\n\nContent\n\n## Another\n\nMore content');
+
+            // getAllSections should return an array
+            const allSections = manager.getAllSections();
+            runner.expect(Array.isArray(allSections)).toBeTruthy();
+            runner.expect(allSections.length).toBe(sections.length);
+        }
+    });
+
+    runner.it('should return all sections from the sections Map', async () => {
+        if (global.SectionManager) {
+            const manager = new global.SectionManager();
+
+            // Create sections
+            manager.createSectionsFromMarkdown('# Test\n\nContent');
+
+            const allSections = manager.getAllSections();
+            const mapSize = manager.sections.size;
+
+            runner.expect(allSections.length).toBe(mapSize);
+        }
+    });
+
+    runner.it('should return sections with proper properties', async () => {
+        if (global.SectionManager) {
+            const manager = new global.SectionManager();
+
+            // Create sections
+            manager.createSectionsFromMarkdown('# Test\n\nContent');
+
+            const allSections = manager.getAllSections();
+
+            if (allSections.length > 0) {
+                const firstSection = allSections[0];
+                runner.expect(firstSection.id).toBeTruthy();
+                runner.expect(firstSection.currentMarkdown).toBeTruthy();
+                runner.expect(typeof firstSection.hasChanges).toBe('function');
+                runner.expect(typeof firstSection.isEditing).toBe('function');
+                runner.expect(typeof firstSection.getStatus).toBe('function');
+            }
+        }
+    });
+});
+
+// Run the tests
+if (require.main === module) {
+    console.log('📊 Running TDD Tests for getAllSections Method Recovery');
+    runner.run().then(() => {
+        console.log('✅ Test run complete - now implement getAllSections!');
+    });
+}
+
+module.exports = runner;