Initial commit: Azure DevOps TUI client

A terminal-based user interface for browsing and managing Azure DevOps
work items. Features include:

- Browse work items with filtering by area, iteration, state, and type
- View work item details with markdown rendering
- Open work items in browser
- Create git branches from work items
- Update work item state
- Keyboard-driven navigation

🤖 Generated with [Claude Code](https://claude.ai/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

internal/config/state.go

@@ -0,0 +1,80 @@
+package config
+
+import (
+	"encoding/json"
+	"os"
+	"path/filepath"
+)
+
+// FilterState holds the persisted filter selections
+type FilterState struct {
+	Sprint   string `json:"sprint"`
+	State    string `json:"state"`
+	Assigned string `json:"assigned"`
+	Area     string `json:"area"`
+}
+
+// getStatePath returns the path to the state file
+func getStatePath() (string, error) {
+	home, err := os.UserHomeDir()
+	if err != nil {
+		return "", err
+	}
+	return filepath.Join(home, ".config", "devops-tui", "state.json"), nil
+}
+
+// LoadFilterState loads the persisted filter state
+func LoadFilterState() (*FilterState, error) {
+	statePath, err := getStatePath()
+	if err != nil {
+		return nil, err
+	}
+
+	data, err := os.ReadFile(statePath)
+	if err != nil {
+		if os.IsNotExist(err) {
+			// Return default state if file doesn't exist
+			return &FilterState{
+				Sprint:   "current",
+				State:    "all",
+				Assigned: "me",
+				Area:     "all",
+			}, nil
+		}
+		return nil, err
+	}
+
+	var state FilterState
+	if err := json.Unmarshal(data, &state); err != nil {
+		// Return default state if file is corrupted
+		return &FilterState{
+			Sprint:   "current",
+			State:    "all",
+			Assigned: "me",
+			Area:     "all",
+		}, nil
+	}
+
+	return &state, nil
+}
+
+// SaveFilterState saves the filter state to disk
+func SaveFilterState(state *FilterState) error {
+	statePath, err := getStatePath()
+	if err != nil {
+		return err
+	}
+
+	// Ensure directory exists
+	dir := filepath.Dir(statePath)
+	if err := os.MkdirAll(dir, 0755); err != nil {
+		return err
+	}
+
+	data, err := json.MarshalIndent(state, "", "  ")
+	if err != nil {
+		return err
+	}
+
+	return os.WriteFile(statePath, data, 0600)
+}