feat(ui): add help modal and copy terminal button

- Add floating help button (?) with keyboard shortcuts modal
- Add Ctrl+? shortcut to open help modal
- Add copy terminal button to copy output to clipboard
- Style kbd elements for keyboard shortcut display
- Update Escape key to close all modals

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

src/web/public/app.js

@@ -158,6 +158,13 @@ class ClaudemanApp {
       // Escape to close modals
       if (e.key === 'Escape') {
         this.closeCaseSelector();
+        this.closeHelp();
+      }
+
+      // Ctrl/Cmd + ? to show help
+      if ((e.ctrlKey || e.metaKey) && (e.key === '?' || e.key === '/')) {
+        e.preventDefault();
+        this.showHelp();
       }
 
       // Ctrl/Cmd + Enter to quick start (when not in terminal)
@@ -726,6 +733,15 @@ class ClaudemanApp {
     document.getElementById('caseSelectorModal').classList.remove('active');
   }
 
+  // Help modal
+  showHelp() {
+    document.getElementById('helpModal').classList.add('active');
+  }
+
+  closeHelp() {
+    document.getElementById('helpModal').classList.remove('active');
+  }
+
   // Actions
   async startRun() {
     const prompt = document.getElementById('promptInput').value.trim();
@@ -971,6 +987,29 @@ class ClaudemanApp {
     this.terminal.writeln('\x1b[90mTerminal cleared\x1b[0m');
   }
 
+  // Copy terminal contents to clipboard
+  async copyTerminal() {
+    try {
+      // Get all text from terminal
+      const buffer = this.terminal.buffer.active;
+      let text = '';
+      for (let i = 0; i < buffer.length; i++) {
+        const line = buffer.getLine(i);
+        if (line) {
+          text += line.translateToString(true) + '\n';
+        }
+      }
+
+      // Strip trailing empty lines
+      text = text.replace(/\n+$/, '\n');
+
+      await navigator.clipboard.writeText(text);
+      this.showToast('Terminal output copied to clipboard', 'success');
+    } catch (err) {
+      this.showToast('Failed to copy: ' + err.message, 'error');
+    }
+  }
+
   // Font size controls
   increaseFontSize() {
     const current = this.terminal.options.fontSize || 14;

src/web/public/index.html

@@ -240,6 +240,7 @@
               <span class="font-size-display" id="fontSizeDisplay">14px</span>
               <button class="btn btn-xs" onclick="app.increaseFontSize()" title="Increase font size (Ctrl+=)">A+</button>
             </div>
+            <button class="btn btn-sm" onclick="app.copyTerminal()" title="Copy terminal output">Copy</button>
             <button class="btn btn-sm" onclick="app.clearTerminal()">Clear</button>
           </div>
         </div>
@@ -277,6 +278,73 @@
         </div>
       </div>
     </div>
+
+    <!-- Help Button -->
+    <button class="help-btn" onclick="app.showHelp()" title="Keyboard shortcuts (Ctrl+?)">?</button>
+
+    <!-- Help Modal -->
+    <div class="modal" id="helpModal">
+      <div class="modal-backdrop" onclick="app.closeHelp()"></div>
+      <div class="modal-content">
+        <div class="modal-header">
+          <h3>Keyboard Shortcuts</h3>
+          <button class="modal-close" onclick="app.closeHelp()">&times;</button>
+        </div>
+        <div class="modal-body">
+          <div class="shortcuts-list">
+            <div class="shortcut-group">
+              <h4>General</h4>
+              <div class="shortcut-row">
+                <kbd>Ctrl</kbd>+<kbd>Enter</kbd>
+                <span>Quick Start</span>
+              </div>
+              <div class="shortcut-row">
+                <kbd>Ctrl</kbd>+<kbd>K</kbd>
+                <span>Kill all sessions</span>
+              </div>
+              <div class="shortcut-row">
+                <kbd>Ctrl</kbd>+<kbd>?</kbd>
+                <span>Show this help</span>
+              </div>
+              <div class="shortcut-row">
+                <kbd>Escape</kbd>
+                <span>Close modals</span>
+              </div>
+            </div>
+            <div class="shortcut-group">
+              <h4>Terminal</h4>
+              <div class="shortcut-row">
+                <kbd>Ctrl</kbd>+<kbd>L</kbd>
+                <span>Clear terminal</span>
+              </div>
+              <div class="shortcut-row">
+                <kbd>Ctrl</kbd>+<kbd>+</kbd>
+                <span>Increase font size</span>
+              </div>
+              <div class="shortcut-row">
+                <kbd>Ctrl</kbd>+<kbd>-</kbd>
+                <span>Decrease font size</span>
+              </div>
+            </div>
+            <div class="shortcut-group">
+              <h4>Navigation</h4>
+              <div class="shortcut-row">
+                <kbd>Ctrl</kbd>+<kbd>1</kbd>
+                <span>Run tab</span>
+              </div>
+              <div class="shortcut-row">
+                <kbd>Ctrl</kbd>+<kbd>2</kbd>
+                <span>Cases tab</span>
+              </div>
+              <div class="shortcut-row">
+                <kbd>Ctrl</kbd>+<kbd>3</kbd>
+                <span>Settings tab</span>
+              </div>
+            </div>
+          </div>
+        </div>
+      </div>
+    </div>
   </div>
 
   <script src="app.js"></script>

src/web/public/styles.css

@@ -1694,3 +1694,75 @@ input[type="checkbox"] {
   align-items: center;
   gap: 0.5rem;
 }
+
+/* Keyboard Shortcuts Modal */
+.shortcuts-list {
+  display: flex;
+  flex-direction: column;
+  gap: 1.5rem;
+}
+
+.shortcut-group h4 {
+  font-size: 0.75rem;
+  font-weight: 600;
+  text-transform: uppercase;
+  letter-spacing: 0.05em;
+  color: var(--text-muted);
+  margin-bottom: 0.75rem;
+  padding-bottom: 0.5rem;
+  border-bottom: 1px solid var(--border);
+}
+
+.shortcut-row {
+  display: flex;
+  justify-content: space-between;
+  align-items: center;
+  padding: 0.5rem 0;
+  font-size: 0.875rem;
+}
+
+.shortcut-row span {
+  color: var(--text-dim);
+}
+
+kbd {
+  display: inline-block;
+  padding: 0.25rem 0.5rem;
+  background: linear-gradient(135deg, #2a2a2a 0%, #1a1a1a 100%);
+  border: 1px solid var(--border);
+  border-radius: 4px;
+  font-family: 'SF Mono', Monaco, monospace;
+  font-size: 0.75rem;
+  color: var(--text);
+  box-shadow: 0 2px 0 var(--border);
+  min-width: 24px;
+  text-align: center;
+}
+
+/* Help button */
+.help-btn {
+  position: fixed;
+  bottom: 1rem;
+  right: 1rem;
+  width: 40px;
+  height: 40px;
+  border-radius: 50%;
+  background: linear-gradient(135deg, #2a2a2a 0%, #1a1a1a 100%);
+  border: 1px solid var(--border);
+  color: var(--text-dim);
+  font-size: 1.25rem;
+  cursor: pointer;
+  z-index: 100;
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  transition: all 0.2s ease;
+  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
+}
+
+.help-btn:hover {
+  background: linear-gradient(135deg, #3a3a3a 0%, #2a2a2a 100%);
+  color: var(--text);
+  transform: translateY(-2px);
+  box-shadow: 0 6px 16px rgba(0, 0, 0, 0.4);
+}