fix(newos4): download link uses the user's space; WebDAV share copies verified file links; preview fullscreen+share; files->WebDAV upload button (v4.6.45)

- download: URL built from _resolveSpaceName() (config url = logged-in user), not the page space
- WebDAV browser 🔗: shares selected FILES only, URL-encoded, HEAD-verified (200) before claiming success;
  folders offer a tar fallback instead of a guaranteed-403 link
- file manager preview: ⛶ fullscreen + 🔗 copy-link toolbar (was none)
- file manager toolbar: ☁ WebDAV publishes selected/current file via webdav-push
- modules/test/test-download-url.js: 4 PASS
- rebuild bundles, bump v4.6.44 -> v4.6.45 (loader + 3 script tags)

1 files changed, 32 insertions, 0 deletions

diff --git a/modules/test/test-download-url.js b/modules/test/test-download-url.js
new file mode 100644
index 0000000..63cabde
--- /dev/null
+++ b/modules/test/test-download-url.js
@@ -0,0 +1,32 @@
+// node modules/test/test-download-url.js
+// Regression guard for the download/share URL space (2026-10-21).
+// The URL must follow the WebDAV config (the logged-in user's space), NOT the
+// page path — /spaces/newos4/ is the app, not the user.
+const cases = [
+  { page: '/spaces/newos4/', cfg: 'https://webx11.duckdns.org/spaces/agando/', want: 'agando' },
+  { page: '/spaces/newos4/', cfg: 'https://webx11.duckdns.org/spaces/mindtech/', want: 'mindtech' },
+  { page: '/spaces/agando/', cfg: 'https://webx11.duckdns.org/spaces/agando/', want: 'agando' },
+  { page: '/spaces/newos4/', cfg: '', want: 'newos4' }, // no config → fall back to the page space
+];
+
+function detectSpaceName(path) {
+  const parts = path.split('/').filter(Boolean);
+  const i = parts.indexOf('spaces');
+  return (i >= 0 && i + 1 < parts.length) ? parts[i + 1] : '';
+}
+function extractSpaceNameFromUrl(url) {
+  if (!url) return '';
+  const parts = new URL(url).pathname.split('/').filter(Boolean);
+  const i = parts.indexOf('spaces');
+  return (i >= 0 && i + 1 < parts.length) ? parts[i + 1] : '';
+}
+
+let bad = 0;
+for (const c of cases) {
+  const got = extractSpaceNameFromUrl(c.cfg) || detectSpaceName(c.page);
+  const ok = got === c.want;
+  if (!ok) bad++;
+  console.log((ok ? 'PASS' : 'FAIL'), c.page, 'cfg=' + (c.cfg || '(none)'), '→', got, '(want', c.want + ')');
+}
+console.log(bad ? `\n${bad} FAILED` : `\n${cases.length} PASS`);
+process.exit(bad ? 1 : 0);