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/notes-tab.html b/web/templates/partials/notes-tab.html
new file mode 100644
index 0000000..526f387
--- /dev/null
+++ b/web/templates/partials/notes-tab.html
@@ -0,0 +1,22 @@
+{{define "notes-tab"}}
+<div class="space-y-10">
+    <!-- Error Messages -->
+    {{template "error-banner" .}}
+
+    <!-- Obsidian Notes Section -->
+    {{if .Notes}}
+        {{template "obsidian-notes" .}}
+    {{else}}
+        <div class="text-center py-20">
+            <svg class="mx-auto h-16 w-16 text-gray-400" fill="none" stroke="currentColor" viewBox="0 0 24 24">
+                <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2"
+                      d="M9 12h6m-6 4h6m2 5H7a2 2 0 01-2-2V5a2 2 0 012-2h5.586a1 1 0 01.707.293l5.414 5.414a1 1 0 01.293.707V19a2 2 0 01-2 2z" />
+            </svg>
+            <h3 class="mt-6 text-xl font-medium text-gray-900">No notes found</h3>
+            <p class="mt-2 text-sm text-gray-500 max-w-md mx-auto">
+                Configure your Obsidian vault path in the settings to see your recent notes displayed here.
+            </p>
+        </div>
+    {{end}}
+</div>
+{{end}}