Fix sqlite_import() passing array instead of string to Process::create()

The command_parts array was being passed directly to \WP_CLI\Process::create()
which requires a string command. This caused proc_open() to fail with
"expects parameter 1 to be string, array given".

Also fixes the .read argument: sqlite3 expects ".read FILENAME" as a single
quoted argument, not as two separate arguments.

Co-authored-by: swissspidy <841956+swissspidy@users.noreply.github.com>

Author: Copilot

src/DB_Command_SQLite.php

@@ -445,18 +445,19 @@ protected function sqlite_import( $file, $assoc_args ) {
 		}
 
 		$command_parts[] = $db_path;
-		$command_parts[] = '.read';
-		$command_parts[] = $import_file;
 
-		// Build debug-friendly command string without using shell redirection.
-		$debug_command = Utils\esc_cmd(
+		// Build a properly escaped string command. Process::create() requires a string, not an array.
+		$command = Utils\esc_cmd(
 			implode( ' ', array_fill( 0, count( $command_parts ), '%s' ) ),
 			...$command_parts
 		);
 
-		WP_CLI::debug( "Running shell command: {$debug_command}", 'db' );
+		// Pass the .read dot-command as a single quoted argument (sqlite3 reads it as SQL input).
+		$command .= ' ' . escapeshellarg( '.read ' . $import_file );
 
-		$result = \WP_CLI\Process::create( $command_parts, null, null )->run();
+		WP_CLI::debug( "Running shell command: {$command}", 'db' );
+
+		$result = \WP_CLI\Process::create( $command, null, null )->run();
 		unlink( $import_file );
 
 		if ( 0 !== $result->return_code ) {