feat(start): recent files as a list, icons or large previews

Three toggles beside the Recent Documents title switch the panel between
the existing list, a grid of thumbnail tiles and one large preview per
file. The choice is kept in the recent section of the app config.

Refs #1494

Co-Authored-By: Claude Opus 5.5 <[email protected]>

locales/pl-PL/opencadstudio.ftl

@@ -99,6 +99,9 @@ start =
     .no-recent-files = Otwarte pliki pojawią się tutaj.
     .browser-storage = Pamięć przeglądarki
     .keep-recent-files = Zachowuj ostatnie pliki
+    .view-list = Lista
+    .view-icons = Ikony
+    .view-preview = Duże podglądy
 
 donation =
     .title = Prośba o darowiznę