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 <noreply@anthropic.com>

locales/lo-LA/opencadstudio.ftl

@@ -99,6 +99,9 @@ start =
     .no-recent-files = ໄຟລ໌ທີ່ທ່ານເປີດຈະສະແດງຢູ່ນີ້.
     .browser-storage = ບ່ອນເກັບຂໍ້ມູນບຣາວເຊີ
     .keep-recent-files = ຮັກສາໄຟລ໌ຫຼ້າສຸດໄວ້
+    .view-list = ລາຍການ
+    .view-icons = ໄອຄອນ
+    .view-preview = ຕົວຢ່າງຂະໜາດໃຫຍ່
 
 donation =
     .title = ຄຳຮ້ອງຂໍການບໍລິຈາກ