feat(save-markdown): add SSH remote filesystem support

Enable saving markdown content directly to remote filesystems
when connected via SSH. The fs:writeFile IPC handler now accepts
an optional sshRemoteId parameter and uses writeFileRemote for
SSH transport.

src/__tests__/renderer/components/SaveMarkdownModal.test.tsx

@@ -6,7 +6,7 @@
  * - Basic rendering
  * - Form validation
  * - Save functionality
- * - SSH remote session behavior (folder browse button visibility)
+ * - SSH remote session behavior (folder browse button visibility, remote saving)
  * - Keyboard interaction (Enter to save)
  * - Error handling
  */
@@ -141,6 +141,51 @@ describe('SaveMarkdownModal', () => {
 			fireEvent.change(folderInput, { target: { value: '/remote/path' } });
 			expect(folderInput).toHaveValue('/remote/path');
 		});
+
+		it('passes sshRemoteId to writeFile when saving to remote', async () => {
+			mockWriteFile.mockResolvedValue({ success: true });
+			render(
+				<SaveMarkdownModal
+					{...defaultProps}
+					isRemoteSession={true}
+					sshRemoteId="ssh-remote-123"
+					defaultFolder="/home/user"
+				/>
+			);
+
+			const filenameInput = screen.getByPlaceholderText('document.md');
+			fireEvent.change(filenameInput, { target: { value: 'remote-doc.md' } });
+
+			const saveButton = screen.getByRole('button', { name: 'Save' });
+			await act(async () => {
+				fireEvent.click(saveButton);
+			});
+
+			expect(mockWriteFile).toHaveBeenCalledWith(
+				'/home/user/remote-doc.md',
+				'# Test Markdown\n\nThis is test content.',
+				'ssh-remote-123'
+			);
+		});
+
+		it('saves without sshRemoteId when not provided', async () => {
+			mockWriteFile.mockResolvedValue({ success: true });
+			render(<SaveMarkdownModal {...defaultProps} isRemoteSession={false} />);
+
+			const filenameInput = screen.getByPlaceholderText('document.md');
+			fireEvent.change(filenameInput, { target: { value: 'local-doc.md' } });
+
+			const saveButton = screen.getByRole('button', { name: 'Save' });
+			await act(async () => {
+				fireEvent.click(saveButton);
+			});
+
+			expect(mockWriteFile).toHaveBeenCalledWith(
+				'/test/folder/local-doc.md',
+				expect.any(String),
+				undefined
+			);
+		});
 	});
 
 	describe('folder browser', () => {
@@ -252,7 +297,8 @@ describe('SaveMarkdownModal', () => {
 
 			expect(mockWriteFile).toHaveBeenCalledWith(
 				'/test/folder/test.md',
-				'# Test Markdown\n\nThis is test content.'
+				'# Test Markdown\n\nThis is test content.',
+				undefined // No SSH remote ID for local save
 			);
 		});
 
@@ -268,7 +314,7 @@ describe('SaveMarkdownModal', () => {
 				fireEvent.click(saveButton);
 			});
 
-			expect(mockWriteFile).toHaveBeenCalledWith('/test/folder/test.md', expect.any(String));
+			expect(mockWriteFile).toHaveBeenCalledWith('/test/folder/test.md', expect.any(String), undefined);
 		});
 
 		it('does not duplicate .md extension', async () => {
@@ -283,7 +329,7 @@ describe('SaveMarkdownModal', () => {
 				fireEvent.click(saveButton);
 			});
 
-			expect(mockWriteFile).toHaveBeenCalledWith('/test/folder/test.md', expect.any(String));
+			expect(mockWriteFile).toHaveBeenCalledWith('/test/folder/test.md', expect.any(String), undefined);
 		});
 
 		it('handles .MD extension case-insensitively', async () => {
@@ -299,7 +345,7 @@ describe('SaveMarkdownModal', () => {
 			});
 
 			// Should not add another .md
-			expect(mockWriteFile).toHaveBeenCalledWith('/test/folder/test.MD', expect.any(String));
+			expect(mockWriteFile).toHaveBeenCalledWith('/test/folder/test.MD', expect.any(String), undefined);
 		});
 
 		it('calls onClose after successful save', async () => {
@@ -384,7 +430,7 @@ describe('SaveMarkdownModal', () => {
 			});
 
 			// Should not have double slash
-			expect(mockWriteFile).toHaveBeenCalledWith('/test/folder/test.md', expect.any(String));
+			expect(mockWriteFile).toHaveBeenCalledWith('/test/folder/test.md', expect.any(String), undefined);
 		});
 
 		it('handles Windows-style paths', async () => {
@@ -402,7 +448,7 @@ describe('SaveMarkdownModal', () => {
 			});
 
 			// Should use backslash for Windows paths
-			expect(mockWriteFile).toHaveBeenCalledWith(`${windowsPath}\\test.md`, expect.any(String));
+			expect(mockWriteFile).toHaveBeenCalledWith(`${windowsPath}\\test.md`, expect.any(String), undefined);
 		});
 	});
 

src/main/ipc/handlers/filesystem.ts

@@ -7,7 +7,7 @@
  * - readFile: Read file contents with image base64 encoding (local & SSH remote)
  * - stat: Get file/directory statistics (local & SSH remote)
  * - directorySize: Calculate directory size recursively (local & SSH remote)
- * - writeFile: Write content to file (local only)
+ * - writeFile: Write content to file (local & SSH remote)
  * - rename: Rename file/directory (local & SSH remote)
  * - delete: Delete file/directory (local & SSH remote)
  * - countItems: Count files and folders recursively (local & SSH remote)
@@ -25,6 +25,7 @@ import { logger } from '../../utils/logger';
 import {
 	readDirRemote,
 	readFileRemote,
+	writeFileRemote,
 	statRemote,
 	directorySizeRemote,
 	renameRemote,
@@ -239,9 +240,23 @@ export function registerFilesystemHandlers(): void {
 		};
 	});
 
-	// Write content to file (local only)
-	ipcMain.handle('fs:writeFile', async (_, filePath: string, content: string) => {
+	// Write content to file (supports SSH remote)
+	ipcMain.handle('fs:writeFile', async (_, filePath: string, content: string, sshRemoteId?: string) => {
 		try {
+			// SSH remote: dispatch to remote fs operations
+			if (sshRemoteId) {
+				const sshConfig = getSshRemoteById(sshRemoteId);
+				if (!sshConfig) {
+					throw new Error(`SSH remote not found: ${sshRemoteId}`);
+				}
+				const result = await writeFileRemote(filePath, content, sshConfig);
+				if (!result.success) {
+					throw new Error(result.error || 'Failed to write remote file');
+				}
+				return { success: true };
+			}
+
+			// Local: use standard fs operations
 			await fs.writeFile(filePath, content, 'utf-8');
 			return { success: true };
 		} catch (error) {

src/main/preload/fs.ts

@@ -72,8 +72,8 @@ export function createFsApi() {
 		/**
 		 * Write file contents
 		 */
-		writeFile: (filePath: string, content: string): Promise<{ success: boolean }> =>
-			ipcRenderer.invoke('fs:writeFile', filePath, content),
+		writeFile: (filePath: string, content: string, sshRemoteId?: string): Promise<{ success: boolean }> =>
+			ipcRenderer.invoke('fs:writeFile', filePath, content, sshRemoteId),
 
 		/**
 		 * Get file/directory stats

src/renderer/components/SaveMarkdownModal.tsx

@@ -22,6 +22,8 @@ export interface SaveMarkdownModalProps {
 	defaultFolder?: string;
 	/** Whether the session is running over SSH (hides folder browser button) */
 	isRemoteSession?: boolean;
+	/** SSH remote ID for saving to remote filesystem */
+	sshRemoteId?: string;
 }
 
 export function SaveMarkdownModal({
@@ -30,6 +32,7 @@ export function SaveMarkdownModal({
 	onClose,
 	defaultFolder = '',
 	isRemoteSession = false,
+	sshRemoteId,
 }: SaveMarkdownModalProps) {
 	const [folder, setFolder] = useState(defaultFolder);
 	const [filename, setFilename] = useState('');
@@ -80,8 +83,8 @@ export function SaveMarkdownModal({
 			const separator = folder.includes('\\') ? '\\' : '/';
 			const fullPath = `${folder}${folder.endsWith(separator) ? '' : separator}${finalFilename}`;
 
-			// Write the file
-			const result = await window.maestro.fs.writeFile(fullPath, content);
+			// Write the file (local or remote via SSH)
+			const result = await window.maestro.fs.writeFile(fullPath, content, sshRemoteId);
 			if (result.success) {
 				onClose();
 			} else {

src/renderer/components/TerminalOutput.tsx

@@ -1709,6 +1709,11 @@ export const TerminalOutput = memo(
 							session.sessionSshRemoteConfig?.enabled &&
 							!!session.sessionSshRemoteConfig?.remoteId
 						}
+						sshRemoteId={
+							session.sessionSshRemoteConfig?.enabled
+								? session.sessionSshRemoteConfig?.remoteId ?? undefined
+								: undefined
+						}
 					/>
 				)}
 			</div>

src/renderer/global.d.ts

@@ -539,7 +539,7 @@ interface MaestroAPI {
 		homeDir: () => Promise<string>;
 		readDir: (dirPath: string, sshRemoteId?: string) => Promise<DirectoryEntry[]>;
 		readFile: (filePath: string, sshRemoteId?: string) => Promise<string>;
-		writeFile: (filePath: string, content: string) => Promise<{ success: boolean }>;
+		writeFile: (filePath: string, content: string, sshRemoteId?: string) => Promise<{ success: boolean }>;
 		stat: (
 			filePath: string,
 			sshRemoteId?: string