feat(ui): add navigation links to Phase 9 features in header

Add navigation menu in header to make Phase 9 features discoverable:
- Library: Main bookshelf view
- Collections: Collection management interface
- Progress: Reading progress visualization across devices
- Devices: Device management and configuration

Navigation is hidden on mobile (responsive design) and visible on
larger screens (md breakpoint and above). This improves UX by
providing clear access to all major features.

templates/header_templ.go

@@ -29,14 +29,14 @@ func Header(user User, currentPath string) templ.Component {
 			templ_7745c5c3_Var1 = templ.NopComponent
 		}
 		ctx = templ.ClearChildren(ctx)
-		templ_7745c5c3_Err = templruntime.WriteString(templ_7745c5c3_Buffer, 1, "<nav class=\"border-b header-nav\" style=\"border-color: var(--border); background-color: var(--bg-secondary)\"><div class=\"max-w-7xl mx-auto px-4 sm:px-6 lg:px-8\"><div class=\"flex justify-between items-center h-16\"><!-- Left: App Title --><div class=\"flex items-center\"><a href=\"/bookshelf\" class=\"text-xl font-bold hover:opacity-80 transition-opacity\" style=\"color: var(--text-primary); text-decoration: none;\">📚 Bookmann</a></div><!-- Center: Search Box --><div class=\"flex-1 max-w-2xl mx-8\"><div class=\"relative\"><input type=\"text\" id=\"header-search\" placeholder=\"Search your library...\" class=\"w-full px-4 py-2 pl-10 border rounded-lg\" style=\"background-color: var(--bg-primary); color: var(--text-primary); border-color: var(--border);\" autocomplete=\"off\"> <svg class=\"absolute left-3 top-2.5 h-5 w-5\" style=\"color: var(--text-secondary)\" fill=\"none\" stroke=\"currentColor\" viewBox=\"0 0 24 24\"><path stroke-linecap=\"round\" stroke-linejoin=\"round\" stroke-width=\"2\" d=\"M21 21l-6-6m2-5a7 7 0 11-14 0 7 7 0 0114 0z\"></path></svg></div></div><!-- Right: Theme Switcher & User Menu --><div class=\"flex items-center space-x-4\"><!-- Theme Switcher --><div class=\"relative\"><button onclick=\"toggleThemeDropdown()\" class=\"p-2 rounded-lg hover:bg-gray-700 transition-colors\" style=\"background-color: var(--bg-primary);\"><svg class=\"h-6 w-6\" style=\"color: var(--text-primary)\" fill=\"none\" stroke=\"currentColor\" viewBox=\"0 0 24 24\"><path stroke-linecap=\"round\" stroke-linejoin=\"round\" stroke-width=\"2\" d=\"M7 21a4 4 0 01-4-4V5a2 2 0 012-2h4a2 2 0 012 2v12a4 4 0 01-4 4zm0 0h12a2 2 0 002-2v-4a2 2 0 00-2-2h-2.343M11 7.343l1.657-1.657a2 2 0 012.828 0l2.829 2.829a2 2 0 010 2.828l-8.486 8.485M7 17h.01\"></path></svg></button><div id=\"theme-dropdown\" class=\"hidden absolute right-0 mt-2 w-64 rounded-lg shadow-lg z-50\" style=\"background-color: var(--bg-secondary); border: 1px solid var(--border);\"><div class=\"p-4\"><h3 class=\"text-sm font-semibold mb-3\" style=\"color: var(--text-primary)\">Select Theme</h3><div class=\"space-y-2\"><button onclick=\"changeThemeTo('tokyo-night')\" class=\"w-full text-left px-3 py-2 rounded hover:opacity-80 transition-opacity\" style=\"color: var(--text-primary); background-color: var(--bg-primary);\"><span class=\"inline-block w-4 h-4 rounded mr-2\" style=\"background-color: #7aa2f7;\"></span> Tokyo Night</button> <button onclick=\"changeThemeTo('dracula')\" class=\"w-full text-left px-3 py-2 rounded hover:opacity-80 transition-opacity\" style=\"color: var(--text-primary); background-color: var(--bg-primary);\"><span class=\"inline-block w-4 h-4 rounded mr-2\" style=\"background-color: #bd93f9;\"></span> Dracula</button> <button onclick=\"changeThemeTo('nord')\" class=\"w-full text-left px-3 py-2 rounded hover:opacity-80 transition-opacity\" style=\"color: var(--text-primary); background-color: var(--bg-primary);\"><span class=\"inline-block w-4 h-4 rounded mr-2\" style=\"background-color: #88c0d0;\"></span> Nord</button> <button onclick=\"changeThemeTo('solarized-dark')\" class=\"w-full text-left px-3 py-2 rounded hover:opacity-80 transition-opacity\" style=\"color: var(--text-primary); background-color: var(--bg-primary);\"><span class=\"inline-block w-4 h-4 rounded mr-2\" style=\"background-color: #2aa198;\"></span> Solarized Dark</button> <button onclick=\"changeThemeTo('monokai')\" class=\"w-full text-left px-3 py-2 rounded hover:opacity-80 transition-opacity\" style=\"color: var(--text-primary); background-color: var(--bg-primary);\"><span class=\"inline-block w-4 h-4 rounded mr-2\" style=\"background-color: #a6e22e;\"></span> Monokai</button> <button onclick=\"changeThemeTo('one-dark-pro')\" class=\"w-full text-left px-3 py-2 rounded hover:opacity-80 transition-opacity\" style=\"color: var(--text-primary); background-color: var(--bg-primary);\"><span class=\"inline-block w-4 h-4 rounded mr-2\" style=\"background-color: #61dafb;\"></span> One Dark Pro</button> <button onclick=\"changeThemeTo('material-dark')\" class=\"w-full text-left px-3 py-2 rounded hover:opacity-80 transition-opacity\" style=\"color: var(--text-primary); background-color: var(--bg-primary);\"><span class=\"inline-block w-4 h-4 rounded mr-2\" style=\"background-color: #80cbc4;\"></span> Material Dark</button><div class=\"border-t pt-2 mt-2\" style=\"border-color: var(--border);\"><p class=\"text-xs mb-2\" style=\"color: var(--text-secondary)\">Background Options</p><button onclick=\"changeThemeTo('wood-light')\" class=\"w-full text-left px-3 py-2 rounded hover:opacity-80 transition-opacity\" style=\"color: var(--text-primary); background-color: var(--bg-primary);\"><span class=\"inline-block w-4 h-4 rounded mr-2\" style=\"background: linear-gradient(135deg, #deb887 0%, #d2a679 100%);\"></span> Wood Light</button> <button onclick=\"changeThemeTo('wood-dark')\" class=\"w-full text-left pLine truncated
+		templ_7745c5c3_Err = templruntime.WriteString(templ_7745c5c3_Buffer, 1, "<nav class=\"border-b header-nav\" style=\"border-color: var(--border); background-color: var(--bg-secondary)\"><div class=\"max-w-7xl mx-auto px-4 sm:px-6 lg:px-8\"><div class=\"flex justify-between items-center h-16\"><!-- Left: App Title & Navigation --><div class=\"flex items-center space-x-6\"><a href=\"/bookshelf\" class=\"text-xl font-bold hover:opacity-80 transition-opacity\" style=\"color: var(--text-primary); text-decoration: none;\">📚 Bookmann</a><div class=\"hidden md:flex items-center space-x-4\"><a href=\"/bookshelf\" class=\"text-sm hover:opacity-80 transition-opacity\" style=\"color: var(--text-secondary); text-decoration: none;\">Library</a> <a href=\"/collections\" class=\"text-sm hover:opacity-80 transition-opacity\" style=\"color: var(--text-secondary); text-decoration: none;\">Collections</a> <a href=\"/progress\" class=\"text-sm hover:opacity-80 transition-opacity\" style=\"color: var(--text-secondary); text-decoration: none;\">Progress</a> <a href=\"/devices\" class=\"text-sm hover:opacity-80 transition-opacity\" style=\"color: var(--text-secondary); text-decoration: none;\">Devices</a></div></div><!-- Center: Search Box --><div class=\"flex-1 max-w-2xl mx-8\"><div class=\"relative\"><input type=\"text\" id=\"header-search\" placeholder=\"Search your library...\" class=\"w-full px-4 py-2 pl-10 border rounded-lg\" style=\"background-color: var(--bg-primary); color: var(--text-primary); border-color: var(--border);\" autocomplete=\"off\"> <svg class=\"absolute left-3 top-2.5 h-5 w-5\" style=\"color: var(--text-secondary)\" fill=\"none\" stroke=\"currentColor\" viewBox=\"0 0 24 24\"><path stroke-linecap=\"round\" stroke-linejoin=\"round\" stroke-width=\"2\" d=\"M21 21l-6-6m2-5a7 7 0 11-14 0 7 7 0 0114 0z\"></path></svg></div></div><!-- Right: Theme Switcher & User Menu --><div class=\"flex items-center space-x-4\"><!-- Theme Switcher --><div class=\"relative\"><button onclick=\"toggleThemeDropdown()\" class=\"p-2 rounded-lg hover:bg-gray-700 transition-colors\" style=\"background-color: var(--bg-primary);\"><svg class=\"h-6 w-6\" style=\"color: var(--text-primary)\" fill=\"none\" stroke=\"currentColor\" viewBox=\"0 0 24 24\"><path stroke-linecap=\"round\" stroke-linejoin=\"round\" stroke-width=\"2\" d=\"M7 21a4 4 0 01-4-4V5a2 2 0 012-2h4a2 2 0 012 2v12a4 4 0 01-4 4zm0 0h12a2 2 0 002-2v-4a2 2 0 00-2-2h-2.343M11 7.343l1.657-1.657a2 2 0 012.828 0l2.829 2.829a2 2 0 010 2.828l-8.486 8.485M7 17h.01\"></path></svg></button><div id=\"theme-dropdown\" class=\"hidden absolute right-0 mt-2 w-64 rounded-lg shadow-lg z-50\" style=\"background-color: var(--bg-secondary); border: 1px solid var(--border);\"><div class=\"p-4\"><h3 class=\"text-sm font-semibold mb-3\" style=\"color: var(--text-primary)\">Select Theme</h3><div class=\"space-y-2\"><button onclick=\"changeThemeTo('tokyo-night')\" class=\"w-full text-left px-3 py-2 rounded hover:opacity-80 transition-opacity\" style=\"color: var(--text-primary); background-color: var(--bg-primary);\"><span class=\"inline-block w-4 h-4 rounded mr-2\" style=\"background-color: #7aa2f7;\"></span> Tokyo Night</button> <button onclick=\"changeThemeTo('dracula')\" class=\"w-full text-left px-3 py-2 rounded hover:opacity-80 transition-opacity\" style=\"color: var(--text-primary); background-color: var(--bg-primary);\"><span class=\"inline-block w-4 h-4 rounded mr-2\" style=\"background-color: #bd93f9;\"></span> Dracula</button> <button onclick=\"changeThemeTo('nord')\" class=\"w-full text-left px-3 py-2 rounded hover:opacity-80 transition-opacity\" style=\"color: var(--text-primary); background-color: var(--bg-primary);\"><span class=\"inline-block w-4 h-4 rounded mr-2\" style=\"background-color: #88c0d0;\"></span> Nord</button> <button onclick=\"changeThemeTo('solarized-dark')\" class=\"w-full text-left px-3 py-2 rounded hover:opacity-80 transition-opacity\" style=\"color: var(--text-primary); background-color: var(--bg-primary);\"><span class=\"inline-block w-4 h-4 rounded mr-2\" style=\"background-color: #2aa198;\"></span> Solarized Dark</button> <button onclick=\"changeThemeTo('monokai')\" class=\"w-full text-left px-3 py-2 rounded hover:opacity-80 transition-opacity\" style=\"color: var(--text-primary); background-color: var(--bg-primary);\"><span class=\"inline-block w-4 h-4 rounded mr-2\" style=\"background-color: #a6e22e;\"></span> Monokai</button> <button onclick=\"changeThemeTo('one-dark-pro')\" class=\"w-full text-left px-3 py-2 rounded hover:opacity-80 transition-opacity\" style=\"color: var(--text-primary); background-color: var(--bg-primary);\"><span class=\"inline-block w-4 h-4 rounded mr-2\" style=\"background-color: #61dafb;\"></span> One Dark Pro</button> <button onclick=\"changeThemeTo('material-dark')\" class=\"w-full text-left px-3 py-2 rounded hover:opacity-80 transition-opacity\" style=\"color: var(--text-primary); background-color: var(--bg-primary);\"><span class=Line truncated
 		if templ_7745c5c3_Err != nil {
 			return templ_7745c5c3_Err
 		}
 		var templ_7745c5c3_Var2 string
 		templ_7745c5c3_Var2, templ_7745c5c3_Err = templ.JoinStringErrs(user.Username)
 		if templ_7745c5c3_Err != nil {
-			return templ.Error{Err: templ_7745c5c3_Err, FileName: `header.templ`, Line: 97, Col: 116}
+			return templ.Error{Err: templ_7745c5c3_Err, FileName: `templates/header.templ`, Line: 111, Col: 116}
 		}
 		_, templ_7745c5c3_Err = templ_7745c5c3_Buffer.WriteString(templ.EscapeString(templ_7745c5c3_Var2))
 		if templ_7745c5c3_Err != nil {