Modernize frontend with tabs, HTMX, and Tailwind build pipeline

Complete UI overhaul implementing modern design patterns with HTMX for
dynamic updates, proper Tailwind build pipeline, and improved UX.

Build Pipeline:
- Add npm + PostCSS + Tailwind CSS configuration
- Custom design system with brand colors
- Compiled CSS: 27KB (vs 3MB CDN), 99% reduction
- Makefile for unified build commands
- Inter font for improved typography

Tab Interface:
- Separate Tasks tab from Notes tab using HTMX
- Partial page updates without full refreshes
- Tab state management with proper refresh handling
- New endpoints: /tabs/tasks, /tabs/notes, /tabs/refresh

Template Architecture:
- Modular partials system (7 reusable components)
- Cleaner separation of concerns

Empty Board Management:
- Active boards in main 3-column grid
- Empty boards in collapsible section
- Reduces visual clutter

Visual Design Enhancements:
- Inter font, brand color accents
- Improved typography hierarchy and spacing
- Enhanced card styling with hover effects

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

1 files changed, 72 insertions, 0 deletions

diff --git a/web/templates/partials/trello-boards.html b/web/templates/partials/trello-boards.html
new file mode 100644
index 0000000..bd460cf
--- /dev/null
+++ b/web/templates/partials/trello-boards.html
@@ -0,0 +1,72 @@
+{{define "trello-boards"}}
+{{if .Boards}}
+<section class="card section-spacing">
+    <!-- Section Header with Brand Color -->
+    <div class="flex items-center gap-3 mb-6">
+        <div class="w-1 h-8 bg-trello rounded"></div>
+        <h2 class="text-2xl font-bold text-gray-900">Trello Boards</h2>
+    </div>
+
+    <!-- Active Boards Grid (boards with cards) -->
+    <div class="card-grid mb-6">
+        {{range .Boards}}
+        {{if .Cards}}
+        <div class="board-card">
+            <h3 class="font-bold text-lg text-gray-900 mb-4">{{.Name}}</h3>
+            <div class="space-y-3 max-h-96 overflow-y-auto scrollbar-thin">
+                {{range .Cards}}
+                <div class="trello-card-item">
+                    <p class="font-medium text-sm text-gray-900 mb-2">{{.Name}}</p>
+                    <div class="flex flex-wrap gap-2 items-center">
+                        {{if .ListName}}
+                        <span class="badge bg-gray-100 text-gray-700">
+                            {{.ListName}}
+                        </span>
+                        {{end}}
+                        {{if .DueDate}}
+                        <span class="badge bg-red-100 text-red-800">
+                            Due: {{.DueDate.Format "Jan 2"}}
+                        </span>
+                        {{end}}
+                        {{if .URL}}
+                        <a href="{{.URL}}" target="_blank"
+                           class="text-trello hover:text-trello/80 text-xs font-medium ml-auto transition-colors">
+                            View →
+                        </a>
+                        {{end}}
+                    </div>
+                </div>
+                {{end}}
+            </div>
+        </div>
+        {{end}}
+        {{end}}
+    </div>
+
+    <!-- Empty Boards Collapsible (boards without cards) -->
+    <details class="mt-6 border-t border-gray-200 pt-6">
+        <summary class="cursor-pointer flex items-center justify-between group">
+            <span class="text-sm font-medium text-gray-600 group-hover:text-gray-900 transition-colors">
+                Empty Boards
+            </span>
+            <svg class="w-5 h-5 text-gray-400 group-hover:text-gray-600 transition-all"
+                 fill="none" stroke="currentColor" viewBox="0 0 24 24">
+                <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M19 9l-7 7-7-7" />
+            </svg>
+        </summary>
+        <div class="mt-4">
+            <div class="card-grid">
+                {{range .Boards}}
+                {{if not .Cards}}
+                <div class="border border-gray-200 rounded-lg p-4 bg-gray-50 opacity-70 hover:opacity-100 transition-opacity">
+                    <h3 class="font-semibold text-gray-700">{{.Name}}</h3>
+                    <p class="text-sm text-gray-500 mt-2">No cards</p>
+                </div>
+                {{end}}
+                {{end}}
+            </div>
+        </div>
+    </details>
+</section>
+{{end}}
+{{end}}