feat: per-task image/annotations, annotation editor toolbar, Tailwind compiled

- Add per-task file upload with image preview in task editor
- Add dedicated annotation editor page (task_drawing.html) with Fabric.js
- Add color picker, stroke width, and line dash controls to annotation toolbar
- Apply property changes to selected objects in real-time
- Disable style controls until a drawing tool or object is selected
- Remove zoom/pan from annotation toolbar (simplified UX)
- Auto-switch to select mode after placing annotation elements
- Show annotation overlay on task image previews (read-only canvas)
- Add file proxy route in measure blueprint for task file access
- Add file_path/file_type fields to TaskCreate/TaskUpdate Pydantic schemas
- Replace Tailwind CDN with compiled CSS (tailwind.config.js with full shades)
- Fix Alpine.js x-init crash: extract annotations JSON to <script> tags
  (recipe_preview.html, task_execute.html) to avoid HTML attribute breakage

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

client/templates/base.html

@@ -18,56 +18,8 @@
   <link rel="preconnect" href="https://fonts.gstatic.com" crossorigin>
   <link href="https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&family=JetBrains+Mono:wght@400;500;600&display=swap" rel="stylesheet">
 
-  <!-- TailwindCSS CDN -->
-  <script src="https://cdn.tailwindcss.com"></script>
-  <script>
-    tailwind.config = {
-      darkMode: 'class',
-      theme: {
-        extend: {
-          colors: {
-            primary: {
-              DEFAULT: '#2563EB',
-              dark: '#1E40AF',
-              light: '#3B82F6',
-              50: '#EFF6FF',
-              100: '#DBEAFE',
-              200: '#BFDBFE',
-              500: '#3B82F6',
-              600: '#2563EB',
-              700: '#1D4ED8',
-              800: '#1E40AF',
-              900: '#1E3A8A',
-            },
-            steel: {
-              DEFAULT: '#64748B',
-              light: '#94A3B8',
-              dark: '#475569',
-              50: '#F8FAFC',
-              100: '#F1F5F9',
-              200: '#E2E8F0',
-              300: '#CBD5E1',
-              400: '#94A3B8',
-              500: '#64748B',
-              600: '#475569',
-              700: '#334155',
-              800: '#1E293B',
-              900: '#0F172A',
-            },
-            measure: {
-              pass: '#059669',
-              warning: '#D97706',
-              fail: '#DC2626',
-            },
-          },
-          fontFamily: {
-            sans: ['Inter', 'system-ui', '-apple-system', 'sans-serif'],
-            mono: ['JetBrains Mono', 'ui-monospace', 'monospace'],
-          },
-        },
-      },
-    }
-  </script>
+  <!-- TailwindCSS (compiled) -->
+  <link rel="stylesheet" href="{{ url_for('static', filename='css/tailwind.css') }}">
 
   <!-- Theme CSS Variables -->
   <link rel="stylesheet" href="{{ url_for('static', filename='css/themes.css') }}">