refactor: Refactor file headers and add Psalm suppressions

- Added Psalm suppression annotations to multiple controller classes
- Added PHPDoc comment blocks to seeders and factories
- Added comments to indicate unused classes and methods
- Removed unused annotations and imports

app/Observers/NoteObserver.php

@@ -9,10 +9,15 @@ use App\Models\Tag;
 use Illuminate\Support\Arr;
 use Illuminate\Support\Collection;
 
+/**
+ * @todo Do we need psalm-suppress for these observer methods?
+ */
 class NoteObserver
 {
     /**
      * Listen to the Note created event.
+     *
+     * @psalm-suppress PossiblyUnusedMethod
      */
     public function created(Note $note): void
     {
@@ -35,6 +40,8 @@ class NoteObserver
 
     /**
      * Listen to the Note updated event.
+     *
+     * @psalm-suppress PossiblyUnusedMethod
      */
     public function updated(Note $note): void
     {
@@ -59,6 +66,8 @@ class NoteObserver
 
     /**
      * Listen to the Note deleting event.
+     *
+     * @psalm-suppress PossiblyUnusedMethod
      */
     public function deleting(Note $note): void
     {