1.1.4: 2-column export + welcome rework with auto-load + archive

- Export dialog goes wide (xl modal) and splits into two columns:
  Project & code on the left (.ruw, runtime.js, animation.js,
  example.html), Media on the right with the per-export size + fps
  inputs followed by MP4 / WebM / GIF / APNG / APNG preview. Skip-
  hidden toggle still spans the full width up top. Single-column
  fallback below 720px.

- Welcome dialog reworked:
  - Always auto-loads the last edited project on boot. The welcome
    dialog opens on top only when the new "Show on start"
    preference is enabled, or unconditionally when there are no
    recents (first-run flow).
  - Two-column body: Recent (max 5 thumbnail tiles, was 8) on the
    left, Archive (compact list view, no thumbnails) on the right.
  - Footer toggle binds to the new useShowWelcomeOnStart shared
    ref so the user can opt out of the boot dialog inline.
- Document settings → Interface tab grows a matching "Show welcome
  screen on start" toggle so users who turned it off can flip it
  back on without diving into localStorage.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

package.json

@@ -1,7 +1,7 @@
 {
   "name": "ruwio",
   "private": true,
-  "version": "1.1.3",
+  "version": "1.1.4",
   "type": "module",
   "scripts": {
     "dev": "vite",