[Share By Email] Fix view model autoloading

[JamBalaya56562]

Summary

• align the Share By Email view namespace with its Models/View.php path
• use the typed view model in both the controller and mailer
• declare rss_url for compatibility with the legacy simple layout
• bump the Share By Email extension version to 0.3.5

Root cause

The view class was stored in Models/View.php but declared and referenced as ShareByEmail\mailers\View. The extension autoloader therefore looked for a non-existent mailers/View.php file. When loading failed, the controller and mailer fell back to the base Minz_View, causing dynamic-property deprecation warnings on PHP 8.2 and an undefined rss_url warning in the legacy simple layout.

Using ShareByEmail\Models\View makes the namespace resolve to the existing file and keeps all view data on declared typed properties.

Fixes #210
Fixes #363

Validation

• confirmed every Share By Email view reference uses ShareByEmail\Models\View
• confirmed no references to ShareByEmail\mailers\View remain
• confirmed entry, to, subject, content, and rss_url are declared on the view model
• confirmed the diff is limited to Share By Email view-related files and metadata

PHPStan and PHPCS were not run locally because PHP is unavailable in the local environment. They are expected to run in GitHub Actions.