Add verbose output and error reporting to watch task

[Copilot]

Watch mode provided no feedback on startup and silently swallowed error codes, making it impossible to debug failures during CSS compilation.

Changes

• Capture return codes: passthru() now captures exit codes and displays error messages on non-zero returns
• Startup feedback: Added informative messages showing theme type and watched directory before entering watch loop
• Consistent error handling: Applied across all three theme builders (HyvaThemes, TailwindCSS, MagentoStandard)

Example

Before:

passthru('npm run watch');  // Errors invisible, no feedback

After:

$io->info('Starting watch mode for Hyvä theme...');
$io->text("Watching directory: $tailwindPath");

$returnCode = 0;
passthru('npm run watch', $returnCode);

if ($returnCode !== 0) {
    $io->error("Watch process exited with error code: $returnCode");
    return false;
}

Real-time npm/grunt output continues to stream through passthru() for live compilation feedback.

Original prompt

---

This section details on the original issue you should resolve

<issue_title>Feature-Request: Verbose Output in Watcher task</issue_title>
<issue_description>Magento 2 Version
latest

Hyvä Version
latest

Is your feature request related to a problem? Please describe.
i get no output if css watcher get an error

Describe the solution you'd like
Get an output during watch task is active
</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes Feature-Request: Verbose Output in Watcher task #49

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