Refactor attachment handling system with enhanced UI (#12085)

* Renamed NewEntryAttachmentsDialog to EditEntryAttachmentsDialog for clarity.
* Introduced EditEntryAttachmentsDialog class to manage editing of existing attachments.
* Added functionality to preview attachments while editing them.
* Enhanced EntryAttachmentsModel with rowByKey method for better key management.
* Add image attachment support with zoom functionality.
* Add html and markdown detection.
* Improve button layout on the attachment section when editing an entry

share/translations/keepassxc_en.ts

@@ -663,6 +663,17 @@
         <translation type="unfinished"></translation>
     </message>
 </context>
+<context>
+    <name>AttachmentWidget</name>
+    <message>
+        <source>Attachment Viewer</source>
+        <translation type="unfinished"></translation>
+    </message>
+    <message>
+        <source>Unknown attachment type</source>
+        <translation type="unfinished"></translation>
+    </message>
+</context>
 <context>
     <name>AutoType</name>
     <message>
@@ -2661,10 +2672,6 @@ This is definitely a bug, please report it to the developers.</source>
         <source>No Results</source>
         <translation type="unfinished"></translation>
     </message>
-    <message>
-        <source>Save</source>
-        <translation type="unfinished"></translation>
-    </message>
     <message>
         <source>Enter a unique name or overwrite an existing search from the list:</source>
         <translation type="unfinished"></translation>
@@ -2833,6 +2840,17 @@ Disable safe saves and try again?</source>
         <source>Failed to save backup database: %1</source>
         <translation type="unfinished"></translation>
     </message>
+    <message>
+        <source>Save</source>
+        <translation type="unfinished"></translation>
+    </message>
+</context>
+<context>
+    <name>EditEntryAttachmentsDialog</name>
+    <message>
+        <source>Edit: %1</source>
+        <translation type="unfinished"></translation>
+    </message>
 </context>
 <context>
     <name>EditEntryWidget</name>
@@ -3904,21 +3922,6 @@ This may cause the affected plugins to malfunction.</source>
         <translation type="unfinished"></translation>
     </message>
 </context>
-<context>
-    <name>EntryAttachmentsDialog</name>
-    <message>
-        <source>Form</source>
-        <translation type="unfinished"></translation>
-    </message>
-    <message>
-        <source>File name</source>
-        <translation type="unfinished"></translation>
-    </message>
-    <message>
-        <source>File contents...</source>
-        <translation type="unfinished"></translation>
-    </message>
-</context>
 <context>
     <name>EntryAttachmentsModel</name>
     <message>
@@ -3944,10 +3947,6 @@ This may cause the affected plugins to malfunction.</source>
         <source>Add new attachment</source>
         <translation type="unfinished"></translation>
     </message>
-    <message>
-        <source>Add</source>
-        <translation type="unfinished"></translation>
-    </message>
     <message>
         <source>Remove selected attachment</source>
         <translation type="unfinished"></translation>
@@ -3968,10 +3967,6 @@ This may cause the affected plugins to malfunction.</source>
         <source>Save selected attachment to disk</source>
         <translation type="unfinished"></translation>
     </message>
-    <message>
-        <source>Save</source>
-        <translation type="unfinished"></translation>
-    </message>
     <message>
         <source>Select files</source>
         <translation type="unfinished"></translation>
@@ -4065,16 +4060,28 @@ Error: %1</source>
 Would you like to overwrite the existing attachment?</source>
         <translation type="unfinished"></translation>
     </message>
-    <message>
-        <source>New</source>
-        <translation type="unfinished"></translation>
-    </message>
     <message>
         <source>Preview</source>
         <translation type="unfinished"></translation>
     </message>
     <message>
-        <source>Failed to preview an attachment: Attachment not found</source>
+        <source>Edit</source>
+        <translation type="unfinished"></translation>
+    </message>
+    <message>
+        <source>New Text Document</source>
+        <translation type="unfinished"></translation>
+    </message>
+    <message>
+        <source>Add file…</source>
+        <translation type="unfinished"></translation>
+    </message>
+    <message>
+        <source>Load from Disk…</source>
+        <translation type="unfinished"></translation>
+    </message>
+    <message>
+        <source>Save…</source>
         <translation type="unfinished"></translation>
     </message>
 </context>
@@ -4640,6 +4647,13 @@ You can enable the DuckDuckGo website icon service in the security section of th
         <translation type="unfinished"></translation>
     </message>
 </context>
+<context>
+    <name>ImageAttachmentsWidget</name>
+    <message>
+        <source>Zoom:</source>
+        <translation type="unfinished"></translation>
+    </message>
+</context>
 <context>
     <name>ImportWizard</name>
     <message>
@@ -6466,25 +6480,6 @@ Expect some bugs and minor issues, this version is meant for testing purposes.</
         <translation type="unfinished"></translation>
     </message>
 </context>
-<context>
-    <name>NewEntryAttachmentsDialog</name>
-    <message>
-        <source>Attachment name cannot be empty</source>
-        <translation type="unfinished"></translation>
-    </message>
-    <message>
-        <source>Attachment with the same name already exists</source>
-        <translation type="unfinished"></translation>
-    </message>
-    <message>
-        <source>Save attachment</source>
-        <translation type="unfinished"></translation>
-    </message>
-    <message>
-        <source>New entry attachment</source>
-        <translation type="unfinished"></translation>
-    </message>
-</context>
 <context>
     <name>NixUtils</name>
     <message>
@@ -7253,15 +7248,15 @@ Do you want to overwrite it?</source>
 <context>
     <name>PreviewEntryAttachmentsDialog</name>
     <message>
-        <source>Preview entry attachment</source>
+        <source>Form</source>
         <translation type="unfinished"></translation>
     </message>
     <message>
-        <source>No preview available</source>
+        <source>Preview: %1</source>
         <translation type="unfinished"></translation>
     </message>
     <message>
-        <source>Image format not supported</source>
+        <source>Save…</source>
         <translation type="unfinished"></translation>
     </message>
 </context>
@@ -9248,6 +9243,10 @@ This option is deprecated, use --set-key-file instead.</source>
         <source>Tags</source>
         <translation type="unfinished"></translation>
     </message>
+    <message>
+        <source>Fit</source>
+        <translation type="unfinished"></translation>
+    </message>
 </context>
 <context>
     <name>QtIOCompressor</name>
@@ -10182,6 +10181,24 @@ This option is deprecated, use --set-key-file instead.</source>
         <translation type="unfinished"></translation>
     </message>
 </context>
+<context>
+    <name>TextAttachmentsEditWidget</name>
+    <message>
+        <source>Preview</source>
+        <translation type="unfinished"></translation>
+    </message>
+</context>
+<context>
+    <name>TextAttachmentsPreviewWidget</name>
+    <message>
+        <source>Form</source>
+        <translation type="unfinished"></translation>
+    </message>
+    <message>
+        <source>Type:</source>
+        <translation type="unfinished"></translation>
+    </message>
+</context>
 <context>
     <name>TotpDialog</name>
     <message>