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, 38 insertions, 0 deletions

diff --git a/tailwind.config.js b/tailwind.config.js
new file mode 100644
index 0000000..05f25ec
--- /dev/null
+++ b/tailwind.config.js
@@ -0,0 +1,38 @@
+/** @type {import('tailwindcss').Config} */
+module.exports = {
+  content: [
+    "./web/templates/**/*.html",
+    "./web/static/js/**/*.js",
+  ],
+  theme: {
+    extend: {
+      colors: {
+        primary: {
+          50: '#eff6ff',
+          100: '#dbeafe',
+          500: '#3b82f6',
+          600: '#2563eb',
+          700: '#1d4ed8',
+        },
+        accent: {
+          50: '#f0f9ff',
+          100: '#e0f2fe',
+          500: '#06b6d4',
+          600: '#0891b2',
+        },
+        trello: '#0079bf',
+        todoist: '#e44332',
+        obsidian: '#7c3aed',
+        plantoeat: '#10b981',
+      },
+      spacing: {
+        '18': '4.5rem',
+        '88': '22rem',
+      },
+      fontFamily: {
+        sans: ['Inter', 'system-ui', 'sans-serif'],
+      },
+    },
+  },
+  plugins: [],
+}