refactor: professional code quality audit

- Fix all TypeScript compilation errors (0 errors in src/)
- Add try/catch error handling to ALL API routes (38 handlers)
- Fix empty catch blocks (api-auth.ts now logs warnings)
- Add aria-labels to all icon-only buttons (WCAG 2.1 AA)
- Fix Prisma type mismatches (OR filter, Person.companyId, Estimate.projectId, Ticket.createdAt)
- Fix webhook PATCH route (moved to [id]/route.ts)
- Fix mobile-bottom-nav type safety
- Fix KB route where-clause type
- Fix test-mail banner null vs undefined
- Fix task comment fetch: add cancellation + error toast
- ESLint: 0 errors, 0 warnings
- 175 files, 24.741 lines of code

public/logo.svg

@@ -0,0 +1,29 @@
+<?xml version="1.0" encoding="utf-8"?>
+<svg version="1.1" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" x="0px" y="0px"
+	 viewBox="0 0 30 30" style="enable-background:new 0 0 30 30;" xml:space="preserve">
+<defs>
+  <style type="text/css">
+    .st194{fill:#2D2D2D;stroke:#FFFFFF;stroke-width:0.6317;stroke-miterlimit:10;}
+    .st23{fill:#FFFFFF;}
+
+    .z-breathe {
+      animation: breathe 2.5s ease-in-out infinite;
+    }
+
+    @keyframes breathe {
+      0%, 100% { opacity: 0.7; }
+      50% { opacity: 1; }
+    }
+  </style>
+</defs>
+
+<g>
+  <path class="st194" d="M24.51,28.51H5.49c-2.21,0-4-1.79-4-4V5.49c0-2.21,1.79-4,4-4h19.03c2.21,0,4,1.79,4,4v19.03
+    C28.51,26.72,26.72,28.51,24.51,28.51z"/>
+  <g class="z-breathe">
+    <path class="st23" d="M15.47,7.1l-1.3,1.85c-0.2,0.29-0.54,0.47-0.9,0.47h-7.1V7.09C6.16,7.1,15.47,7.1,15.47,7.1z"/>
+    <polygon class="st23" points="24.3,7.1 13.14,22.91 5.7,22.91 16.86,7.1"/>
+    <path class="st23" d="M14.53,22.91l1.31-1.86c0.2-0.29,0.54-0.47,0.9-0.47h7.09v2.33H14.53z"/>
+  </g>
+</g>
+</svg>