Fix type mismatch in PostController authorization checks

[Copilot]

Authorization checks were comparing incompatible types: $post->getAuthor() (User object) with $user->getUsername() (string).

Changes

• Fixed three authorization checks in PostController (edit form, update action, delete action)
• Changed comparison from $post->getAuthor() !== $user->getUsername() to $post->getAuthorId() !== $user->getId()

// Before: comparing User object with string
if( !$user->isAdmin() && !$user->isEditor() && $post->getAuthor() !== $user->getUsername() )

// After: comparing integer IDs
if( !$user->isAdmin() && !$user->isEditor() && $post->getAuthorId() !== $user->getId() )

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