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, 22 insertions, 0 deletions

diff --git a/web/templates/partials/tasks-tab.html b/web/templates/partials/tasks-tab.html
new file mode 100644
index 0000000..5678193
--- /dev/null
+++ b/web/templates/partials/tasks-tab.html
@@ -0,0 +1,22 @@
+{{define "tasks-tab"}}
+<div class="space-y-10">
+    <!-- Error Messages -->
+    {{template "error-banner" .}}
+
+    <!-- Trello Boards Section -->
+    {{template "trello-boards" .}}
+
+    <!-- Todoist + PlanToEat Grid -->
+    <div class="grid grid-cols-1 lg:grid-cols-3 gap-6">
+        <!-- Todoist (2 cols) -->
+        <div class="lg:col-span-2">
+            {{template "todoist-tasks" .}}
+        </div>
+
+        <!-- PlanToEat (1 col) -->
+        <div>
+            {{template "plantoeat-meals" .}}
+        </div>
+    </div>
+</div>
+{{end}}