feat: Sprint 3 — settings page with tabs/toggles/devices/danger-zone, brief page

app/backend/internal/model/config.go

@@ -0,0 +1,39 @@
+package model
+
+type AppConfig struct {
+	Theme            string `json:"theme"`            // light | dark
+	FontSize         int    `json:"fontSize"`         // 12-18
+	Scrollback       int    `json:"scrollback"`       // 1000-10000
+	AutoLock         int    `json:"autoLock"`         // minutes
+	Keepalive        bool   `json:"keepalive"`
+	CopyOnSelect     bool   `json:"copyOnSelect"`
+	BellEnabled      bool   `json:"bellEnabled"`
+	AutoReconnect    bool   `json:"autoReconnect"`
+	BlinkCursor      bool   `json:"blinkCursor"`
+}
+
+type ConfigStore struct {
+	Config AppConfig
+}
+
+func NewConfigStore() *ConfigStore {
+	return &ConfigStore{Config: defaultConfig()}
+}
+
+func (s *ConfigStore) Get() AppConfig { return s.Config }
+
+func (s *ConfigStore) Update(cfg AppConfig) { s.Config = cfg }
+
+func defaultConfig() AppConfig {
+	return AppConfig{
+		Theme:         "light",
+		FontSize:      14,
+		Scrollback:    5000,
+		AutoLock:      5,
+		Keepalive:     true,
+		CopyOnSelect:  true,
+		BellEnabled:   false,
+		AutoReconnect: true,
+		BlinkCursor:   false,
+	}
+}

app/backend/internal/model/device.go

@@ -0,0 +1,28 @@
+package model
+
+type Device struct {
+	ID        string `json:"id"`
+	Name      string `json:"name"`
+	Type      string `json:"type"` // desktop | mobile | tablet
+	OS        string `json:"os"`
+	LastSeen  string `json:"lastSeen"`
+	Current   bool   `json:"current"`
+}
+
+type DeviceStore struct {
+	Devices []Device
+}
+
+func NewDeviceStore() *DeviceStore {
+	return &DeviceStore{Devices: defaultDevices()}
+}
+
+func (s *DeviceStore) All() []Device { return s.Devices }
+
+func defaultDevices() []Device {
+	return []Device{
+		{ID: "d1", Name: "MacBook Pro M4", Type: "desktop", OS: "macOS 15 Sequoia", LastSeen: "Just now", Current: true},
+		{ID: "d2", Name: "iPhone 17 Pro", Type: "mobile", OS: "iOS 20", LastSeen: "2 hours ago", Current: false},
+		{ID: "d3", Name: "iPad Air M3", Type: "tablet", OS: "iPadOS 20", LastSeen: "Yesterday", Current: false},
+	}
+}