feat(onboarding): improve setup UX with clickable triggers and auto-fill buttons

- Turn the "/setup" text on the welcome screen and fallback state into a clickable link that automatically runs the setup command.
- Add an interactive down-arrow "Use in Chat" button next to copy button on typewriter-generated setup code blocks.
- Programmatically trim the "..." placeholder when inserting API keys, focusing the cursor right after "sk-".
- Implement click-delegation for supported provider spans and raw code elements inside the setup guide to instantly pre-populate the input bar.

static/index.html

@@ -928,7 +928,7 @@
       <div class="chat-meta-overlay"><span id="current-meta">Odysseus Chat</span><span id="current-meta-count" class="chat-meta-count" aria-hidden="true"></span><span id="session-cost-display" class="session-cost-display" style="display:none;"></span><span class="export-dropdown-wrap" id="export-dropdown-wrap"><button type="button" class="export-dl-btn" id="export-dl-btn" title="More"><svg width="13" height="13" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2.5" stroke-linecap="round" stroke-linejoin="round"><polyline points="6 9 12 15 18 9"/></svg></button><div class="export-dropdown-menu" id="export-dropdown-menu"><div class="export-dropdown-item" id="export-rename-btn"><span class="dropdown-icon"><svg width="14" height="14" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><path d="M17 3a2.83 2.83 0 1 1 4 4L7.5 20.5 2 22l1.5-5.5Z"/></svg></span><span>Rename</span></div><div class="export-dropdown-item" id="export-copy-btn"><span class="dropdown-icon"><svg width="14" height="14" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><rect x="9" y="9" width="13" height="13" rx="2"/><path d="M5 15H4a2 2 0 0 1-2-2V4a2 2 0 0 1 2-2h9a2 2 0 0 1 2 2v1"/></svg></span><span>Copy Chat</span></div><div class="export-dropdown-item" id="export-pdf-btn"><span class="dropdown-icon"><svg width="14" height="14" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><path d="M14 2H6a2 2 0 0 0-2 2v16a2 2 0 0 0 2 2h12a2 2 0 0 0 2-2V8z"/><polyline points="14 2 14 8 20 8"/><path d="M9 15v-2h2a1.5 1.5 0 0 1 0 3H9z"/></svg></span><span>PDF</span></div><div class="export-dropdown-item" id="export-doc-btn"><span class="dropdown-icon"><svg width="14" height="14" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><path d="M14 2H6a2 2 0 0 0-2 2v16a2 2 0 0 0 2 2h12a2 2 0 0 0 2-2V8z"/><polyline points="14 2 14 8 20 8"/><line x1="16" y1="13" x2="8" y2="13"/><line x1="16" y1="17" x2="8" y2="17"/><polyline points="10 9 9 9 8 9"/></svg></span><span>Save to Documents</span></div></div></span></div>    </div>
     <div id="welcome-screen">
       <div class="welcome-name"><svg class="welcome-boat" viewBox="0 0 32 32"><path d="M16 4L16 22L6 22Z" fill="currentColor"/><path d="M16 8L16 22L24 22Z" fill="currentColor" opacity="0.6"/><path d="M4 24Q10 20 16 24Q22 28 28 24" stroke="currentColor" stroke-width="2.5" fill="none" stroke-linecap="round"/></svg>Odysseus</div>
-      <div class="welcome-sub" id="welcome-sub">Welcome, type /setup to get started.</div>
+      <div class="welcome-sub" id="welcome-sub">Welcome, <span class="setup-trigger-link" style="color:var(--accent,var(--red));font-weight:600;cursor:pointer;text-decoration:underline;" title="Click to launch setup">type /setup</span> to get started.</div>
       <div class="welcome-tip" id="welcome-tip"></div>
       <button type="button" class="incognito-btn" id="incognito-btn" title="Enable Nobody mode — no memory, no history saved">
         <svg class="eye-open" width="14" height="14" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round">
@@ -1266,10 +1266,10 @@
       <div class="modal-body">
         <div style="margin-bottom: 12px;">
           <label for="session-name-input" style="display: block; margin-bottom: 6px; font-weight: 500;">Session Name</label>
-          <input 
-            type="text" 
-            id="session-name-input" 
-            placeholder="Enter session name" 
+          <input
+            type="text"
+            id="session-name-input"
+            placeholder="Enter session name"
             style="width: 100%; padding: 8px; border-radius: 4px;"
           />
         </div>
@@ -2106,7 +2106,7 @@
 
         <!-- ═══ SYSTEM TAB ═══ -->
         <div data-settings-panel="system" class="hidden">
-          
+
           <div class="admin-card">
             <h2><svg width="14" height="14" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" style="vertical-align:-2px;margin-right:5px;opacity:0.6"><path d="M21 15v4a2 2 0 0 1-2 2H5a2 2 0 0 1-2-2v-4"/><polyline points="17 8 12 3 7 8"/><line x1="12" y1="3" x2="12" y2="15"/></svg>Data Backup</h2>
             <div class="admin-toggle-sub" style="margin-bottom:8px">Export or import your user data (memories, presets, settings, skills, preferences) as a JSON file.</div>