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/handler/terminal.go

@@ -28,13 +28,17 @@ func Terminal(c *fiber.Ctx) error {
 		}
 	}
 	hostsJSON, _ := json.Marshal(available)
-	return c.Render("terminal", fiber.Map{
+	data := fiber.Map{
 		"View":      "terminal",
 		"Title":     "Terminal",
 		"NavItems":  navItems,
 		"Hosts":     available,
 		"HostsJSON": string(hostsJSON),
-	})
+	}
+	if c.Get("HX-Request") != "" {
+		return c.Render("terminal_content", data)
+	}
+	return c.Render("terminal", data)
 }
 
 func TerminalWS(c *websocket.Conn) {