fix: UI overhaul — align all HTMX views with Lumina Design System (46 fixes)

- All 7 pages rewritten: Dashboard, Terminal, Snippets, Keychain, SFTP, Settings, Brief
- Apply consistent Lumina glassmorphic theme (rounded-2xl, shadows, borders, tracking)
- Fix SVG icons not rendering — return template.HTML instead of string
- Fix Alpine x-data scoping: terminal tabs, SFTP modals, snippet tag buttons
- Fix dashboard search sending literal ?q=...
- Rebuild CSS with all new Tailwind classes (62KB)
- Add .air.toml with hot-reload config, docs/PERBAIKANUI.md checklist
- Remove unused backup partials

app/backend/internal/store/snippet.go

@@ -26,31 +26,47 @@ func (s *SnippetStore) All() []model.Snippet {
 	return s.snippets
 }
 
-func (s *SnippetStore) Search(q string) []model.Snippet {
+func (s *SnippetStore) Search(q, collection, tag string) []model.Snippet {
 	mu.RLock()
 	defer mu.RUnlock()
-	if q == "" {
-		return s.snippets
-	}
 	var res []model.Snippet
 	for _, sn := range s.snippets {
-		if contains(sn.Name, q) || contains(sn.Content, q) || contains(sn.Language, q) {
-			res = append(res, sn)
+		if q != "" && !contains(sn.Name, q) && !contains(sn.Content, q) && !contains(sn.Language, q) {
+			continue
 		}
+		if collection != "" && sn.Collection != collection {
+			continue
+		}
+		if tag != "" {
+			found := false
+			for _, t := range sn.Tags {
+				if t == tag {
+					found = true
+					break
+				}
+			}
+			if !found {
+				continue
+			}
+		}
+		res = append(res, sn)
 	}
 	return res
 }
 
-func (s *SnippetStore) Add(name, content, language string, tags []string) model.Snippet {
+func (s *SnippetStore) Add(name, content, language string, tags []string, description, collection string) model.Snippet {
 	mu.Lock()
 	defer mu.Unlock()
 	sn := model.Snippet{
-		ID:        randID(),
-		Name:      name,
-		Content:   content,
-		Language:  language,
-		Tags:      tags,
-		CreatedAt: time.Now().Format("Jan 2, 2006"),
+		ID:          randID(),
+		Name:        name,
+		Content:     content,
+		Language:    language,
+		Description: description,
+		Collection:  collection,
+		Icon:        "FileText",
+		Tags:        tags,
+		CreatedAt:   time.Now().Format("Jan 2, 2006"),
 	}
 	s.snippets = append(s.snippets, sn)
 	writeFile("snippets.json", &s.snippets)