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>

app/Models/ShareFile.php

@@ -10,6 +10,11 @@ class ShareFile extends Model
 {
     use HasFactory;
 
+    /**
+     * The most a share's private text may hold, in UTF-8 bytes: one chunk of the upload pipeline.
+     */
+    public const MAX_TEXT_BYTES = 100 * 1024;
+
     protected $fillable = [
         'share_id',
         'original_name',
@@ -17,6 +22,7 @@ class ShareFile extends Model
         'stored_path',
         'file_size',
         'mime_type',
+        'is_text',
         'uploaded_chunks',
         'completed_at',
     ];
@@ -28,6 +34,7 @@ class ShareFile extends Model
     {
         return [
             'file_size' => 'integer',
+            'is_text' => 'boolean',
             'uploaded_chunks' => 'integer',
             'completed_at' => 'datetime',
         ];