Release 2.3.0

A share can now hold a private text (a password, a key, a short note)
with its files or on its own. The upload page's new "Private text" card
takes up to 100 KB; the browser encrypts the text and sends it through
the same chunk pipeline as a file, flagged is_text on share_files, so it
gets the share's password, expiry, download limit and cleanup.

The recipient sees the text only after pressing "Show text", which
counts as their download, so a messenger link preview cannot use up a
share limited to one download. The text is left out of the file list,
the ZIP and the file counts; the admin dashboard marks shares that hold
one with "Text".

The website gains a Private text feature card and a fifth phone
screenshot; every screenshot is retaken.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

database/factories/ShareFileFactory.php

@@ -25,6 +25,7 @@ class ShareFileFactory extends Factory
             'stored_path' => 'shares/'.fake()->uuid().'.enc',
             'file_size' => fake()->numberBetween(1024, 10485760),
             'mime_type' => 'text/plain',
+            'is_text' => false,
             'uploaded_chunks' => 1,
             'completed_at' => now(),
         ];
@@ -41,4 +42,17 @@ class ShareFileFactory extends Factory
             'completed_at' => null,
         ]);
     }
+
+    /**
+     * A share's private text.
+     */
+    public function text(): static
+    {
+        return $this->state(fn (array $attributes) => [
+            'original_name' => 'text.txt',
+            'relative_path' => null,
+            'file_size' => fake()->numberBetween(1, 1024),
+            'is_text' => true,
+        ]);
+    }
 }