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, 87 insertions, 7 deletions

diff --git a/modules/ext/filemgr.js b/modules/ext/filemgr.js
index e099a34..01d1da9 100644
--- a/modules/ext/filemgr.js
+++ b/modules/ext/filemgr.js
@@ -439,6 +439,16 @@ class FileManagerModule {
         batchBar.appendChild(selModeBtn);
         toolbar.appendChild(batchBar);
 
+        // 2026-10-21: publish a VFS file to the user's WebDAV space was terminal-only.
+        const wdavBtn = document.createElement('button');
+        wdavBtn.textContent = '☁ WebDAV';
+        wdavBtn.title = 'Upload the selected/current file to your WebDAV space and get its public link';
+        wdavBtn.style.cssText = 'background:var(--bg-tertiary);border:1px solid var(--border-color);' +
+            'color:var(--text-color);cursor:pointer;padding:4px 10px;border-radius:4px;' +
+            'font-family:inherit;font-size:0.9em;min-height:32px;touch-action:manipulation;';
+        wdavBtn.onclick = () => this._uploadSelectionToWebdav();
+        toolbar.appendChild(wdavBtn);
+
         overlay.appendChild(toolbar);
 
         // Main area — wraps sidebar + preview in a responsive flex container
@@ -907,7 +917,8 @@ class FileManagerModule {
 
         // For raw mode, show raw text regardless of type
         if (this._rawMode && typeof content === 'string') {
-            preview.innerHTML = '<div style="padding:12px"><div style="color:var(--text-muted);font-size:0.85em;margin-bottom:8px">RAW: ' + this._escapeHtml(path) + '</div><pre style="white-space:pre-wrap;font-family:var(--font-primary);font-size:0.9em;margin:0;overflow-x:auto">' + this._escapeHtml(content.substring(0, 10000)) + '</pre></div>';
+            preview.innerHTML = this._previewShell(path, '<div style="padding:12px"><div style="color:var(--text-muted);font-size:0.85em;margin-bottom:8px">RAW: ' + this._escapeHtml(path) + '</div><pre style="white-space:pre-wrap;font-family:var(--font-primary);font-size:0.9em;margin:0;overflow-x:auto">' + this._escapeHtml(content.substring(0, 10000)) + '</pre></div>');
+            this._wirePreviewToolbar(path);
             this._updateStatus('Preview: ' + path);
             return;
         }
@@ -917,19 +928,88 @@ class FileManagerModule {
         const textTypes = ['md', 'text', 'json', 'code', 'csv', 'other'];
         if (textTypes.includes(type) && typeof content === 'string' && content.length > 51200) {
             content = content.substring(0, 51200);
-            preview.innerHTML = this._getPreviewHtml(path, content);
-            const truncatedMsg = document.createElement('div');
-            truncatedMsg.style.cssText = 'color:var(--warning-color);padding:8px 12px;border-top:1px solid var(--border-color);font-size:0.85em;';
-            truncatedMsg.textContent = '(truncated — file exceeds 50KB)';
-            preview.appendChild(truncatedMsg);
+            preview.innerHTML = this._previewShell(path,
+                this._getPreviewHtml(path, content) +
+                '<div style="color:var(--warning-color);padding:8px 12px;border-top:1px solid var(--border-color);font-size:0.85em;">(truncated — file exceeds 50KB)</div>');
+            this._wirePreviewToolbar(path);
             this._updateStatus('Preview: ' + path);
             return;
         }
 
-        preview.innerHTML = this._getPreviewHtml(path, content);
+        preview.innerHTML = this._previewShell(path, this._getPreviewHtml(path, content));
+        this._wirePreviewToolbar(path);
         this._updateStatus('Preview: ' + path);
     }
 
+    // 2026-10-21: preview pane had no fullscreen and no share action.
+    _previewShell(path, innerHtml) {
+        return '<div class="fm-preview-toolbar" style="display:flex;gap:6px;justify-content:flex-end;' +
+               'padding:6px 8px;border-bottom:1px solid var(--border-color);flex-shrink:0">' +
+               '<button class="fm-btn-fs" title="Fullscreen preview" aria-label="Fullscreen preview" style="background:var(--bg-tertiary);' +
+               'border:1px solid var(--border-color);color:var(--text-color);padding:2px 8px;border-radius:4px;' +
+               'cursor:pointer;font-size:0.85em;min-height:24px;">⛶</button>' +
+               '<button class="fm-btn-share" title="Copy share link" aria-label="Copy share link" style="background:var(--bg-tertiary);' +
+               'border:1px solid var(--border-color);color:var(--text-color);padding:2px 8px;border-radius:4px;' +
+               'cursor:pointer;font-size:0.85em;min-height:24px;">🔗</button>' +
+               '</div><div class="fm-preview-body" style="flex:1;min-height:0;overflow:auto">' + innerHtml + '</div>';
+    }
+
+    _previewShareUrl(path) {
+        const wdav = this.terminal && this.terminal.moduleManager && this.terminal.moduleManager.modules
+            ? this.terminal.moduleManager.modules.WebDAVModule : null;
+        const space = (wdav && wdav._resolveSpaceName && wdav._resolveSpaceName()) || '';
+        const clean = String(path).replace(/^\/+/, '');
+        return 'https://webx11.duckdns.org/spaces/' + space + '/' +
+            clean.split('/').map(encodeURIComponent).join('/');
+    }
+
+    // 2026-10-21: publish VFS file(s) to WebDAV (was terminal-only: webdav-push)
+    async _uploadSelectionToWebdav() {
+        let targets = this._getSelectedPaths ? this._getSelectedPaths() : [];
+        if (!targets || !targets.length) targets = this._selectedFile ? [this._selectedFile] : [];
+        if (!targets.length) { this._updateStatus('☁ Select a file first'); return; }
+        const wdav = this.terminal && this.terminal.moduleManager && this.terminal.moduleManager.modules
+            ? this.terminal.moduleManager.modules.WebDAVModule : null;
+        if (!wdav) { this._updateStatus('☁ WebDAV module not loaded'); return; }
+        if (!wdav.config || !wdav.config.url) { try { await wdav._autoBootstrap(); } catch (e) {} }
+        if (!wdav.config || !wdav.config.url) { this._updateStatus('☁ WebDAV not configured — run webdav-config'); return; }
+        for (const p of targets) {
+            const clean = String(p).replace(/^\/+/, '');
+            try {
+                await this.terminal.security.checkAndRun('webdav-push ' + clean);
+                const shareUrl = this._previewShareUrl(clean);
+                this._updateStatus('☁ Uploaded ' + clean + ' → ' + shareUrl);
+                if (this.terminal.print) this.terminal.print('☁ WebDAV: ' + shareUrl, 'success');
+            } catch (e) {
+                this._updateStatus('☁ Upload failed: ' + (e && e.message ? e.message : e));
+            }
+        }
+    }
+
+    _wirePreviewToolbar(path) {
+        const pane = document.getElementById('filemgr-preview');
+        if (!pane) return;
+        const fsBtn = pane.querySelector('.fm-btn-fs');
+        const shBtn = pane.querySelector('.fm-btn-share');
+        if (fsBtn) fsBtn.onclick = () => {
+            const body = pane.querySelector('.fm-preview-body') || pane;
+            if (document.fullscreenElement) { document.exitFullscreen(); return; }
+            if (body.requestFullscreen) body.requestFullscreen().catch(() => this._updateStatus('⛶ Fullscreen blocked by this browser'));
+            else if (body.webkitRequestFullscreen) body.webkitRequestFullscreen();
+            else this._updateStatus('⛶ Fullscreen not supported here');
+        };
+        if (shBtn) shBtn.onclick = () => {
+            const url = this._previewShareUrl(path);
+            if (navigator.clipboard && navigator.clipboard.writeText) {
+                navigator.clipboard.writeText(url)
+                    .then(() => this._updateStatus('🔗 Link copied: ' + url))
+                    .catch(() => prompt('Copy share link:', url));
+            } else {
+                prompt('Copy share link:', url);
+            }
+        };
+    }
+
     _renderPreviewError(msg) {
         const preview = document.getElementById('filemgr-preview');
         if (!preview) return;