local-workspace: fix peek-header icons vertical stacking — add missing flex CSS

The .peek-header class from library.html CSS was not available on the
local-workspace page, causing header buttons to stack vertically.
Added inline display:flex;align-items:center;gap:4px on the header div.

app/templates/local_workspace.html

@@ -2883,7 +2883,7 @@ console.log('FLOWDECK v2.4.6 — IIFE done, _wsInitData keys:', Object.keys(wind
 
   <!-- Preview Panel — identical to Library peek-overlay -->
   <div id="ws-preview-panel" style="position:fixed;top:0;right:0;width:560px;max-width:90vw;height:100vh;background:var(--bg-modal);border-left:1px solid var(--border);box-shadow:-8px 0 32px rgba(0,0,0,0.25);z-index:500;display:none;flex-direction:column;transform:translateX(100%);transition:transform 0.2s cubic-bezier(0.16,1,0.3,1);">
-    <div class="peek-header">
+    <div class="peek-header" style="display:flex;align-items:center;gap:4px;padding:12px 16px;border-bottom:1px solid var(--border);">
       <button onclick="window._wsData.closePreviewPanel()" title="Close" style="background:transparent;border:none;color:var(--text-secondary);cursor:pointer;padding:6px;border-radius:4px;display:flex;align-items:center;">
         <svg viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" style="width:15px;height:15px;"><line x1="18" y1="6" x2="6" y2="18"/><line x1="6" y1="6" x2="18" y2="18"/></svg>
       </button>