feat: add issue discovery view for managing discovery sessions and findings

- Implemented main render function for the issue discovery view.
- Added data loading functions to fetch discoveries, details, findings, and progress.
- Created rendering functions for discovery list and detail sections.
- Introduced filtering and searching capabilities for findings.
- Implemented actions for exporting and dismissing findings.
- Added polling mechanism to track discovery progress.
- Included utility functions for HTML escaping and cleanup.

ccw/src/templates/dashboard.html

@@ -418,6 +418,11 @@
                 <span class="nav-text flex-1" data-i18n="nav.issueManager">Manager</span>
                 <span class="badge px-2 py-0.5 text-xs font-semibold rounded-full bg-hover text-muted-foreground" id="badgeIssues">0</span>
               </li>
+              <li class="nav-item flex items-center gap-2 px-3 py-2.5 text-sm text-muted-foreground hover:bg-hover hover:text-foreground rounded cursor-pointer transition-colors" data-view="issue-discovery" data-tooltip="Issue Discovery">
+                <i data-lucide="search-code" class="nav-icon"></i>
+                <span class="nav-text flex-1" data-i18n="nav.issueDiscovery">Discovery</span>
+                <span class="badge px-2 py-0.5 text-xs font-semibold rounded-full bg-hover text-muted-foreground" id="badgeDiscovery">0</span>
+              </li>
             </ul>
           </div>