Keep the monday import going when an author or a board fails

The importer only creates accounts for active monday users. An update or
reply written by a deactivated staff member or an outside guest looked up
an account that didn't exist, bound undefined to SQLite, and stopped the
whole import ("Provided value cannot be bound to SQLite parameter 4").
Those posts now import with the author's name and no linked account.

A board that fails partway is now deleted and the import moves on, so the
next run retries it instead of skipping a half-imported board. A rejected
token or persistent rate limiting still stops the run. The import page
says "finished with errors" when some boards made it.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

server/public/js/pages.js

@@ -263,7 +263,7 @@ function MondayImport() {
     </div>
     <button class="btn primary" disabled=${!sel.length || status?.running} onClick=${start}>Import ${sel.length} board${sel.length === 1 ? '' : 's'}</button>` : null}
     ${status && (status.running || status.log.length) ? html`<div class="import-log">
-      <div class="row gap"><strong>${status.running ? 'Importing…' : status.error ? 'Import failed' : 'Import finished'}</strong>${status.running ? html`<${Spinner} />` : null}
+      <div class="row gap"><strong>${status.running ? 'Importing…' : status.error ? (status.counts.boards ? 'Import finished with errors' : 'Import failed') : 'Import finished'}</strong>${status.running ? html`<${Spinner} />` : null}
         <span class="muted small">${status.counts.boards || 0} boards · ${status.counts.items || 0} items · ${status.counts.updates || 0} updates · ${status.counts.files || 0} files</span></div>
       <pre>${status.log.slice(-200).join('\n')}</pre></div>` : null}
   </div>`;