Implement TUI for managing suspicious artifacts (FilePicker, TypePicker, ListView, and DetailView)

Introduce Bubble Tea-based terminal UI to manage suspicious artifact findings, including file selection, type filtering, list view, and details.

internal/tui/app_test.go

@@ -0,0 +1,105 @@
+package tui
+
+import (
+	"os"
+	"path/filepath"
+	"testing"
+	"time"
+
+	tea "github.com/charmbracelet/bubbletea"
+)
+
+// writeTestReport creates a minimal JSON report envelope with empty findings
+func writeTestReport(t *testing.T, dir, name string, withFindings bool) string {
+	t.Helper()
+	path := filepath.Join(dir, name)
+	var content string
+	if withFindings {
+		content = `{
+			"reportName": "rmm-hunter-report",
+			"generatedAt": "2025-01-01T00:00:00Z",
+			"riskRating": {"score":0, "rating":"Low", "summary":""},
+			"findings": {"processes":[],"services":[],"binaries":[],"autoRuns":[],"scheduledTasks":[],"outboundConnections":[],"directories":[]}
+		}`
+	} else {
+		content = `{}`
+	}
+	if err := os.WriteFile(path, []byte(content), 0644); err != nil {
+		t.Fatalf("failed to write test report: %v", err)
+	}
+	return path
+}
+
+func TestAppFlow_SelectFile_SelectType_Back_Quit(t *testing.T) {
+	// Run in a temp dir so file picker sees our .json
+	tmp := t.TempDir()
+	if err := os.Chdir(tmp); err != nil {
+		t.Fatalf("chdir: %v", err)
+	}
+	_ = writeTestReport(t, tmp, "test.json", true)
+
+	p := tea.NewProgram(NewApp(), tea.WithoutRenderer())
+	done := make(chan error, 1)
+	go func() {
+		_, err := p.Run()
+		done <- err
+	}()
+
+	// Give init a moment to load files
+	time.Sleep(100 * time.Millisecond)
+
+	// Select file
+	p.Send(tea.KeyMsg{Type: tea.KeyEnter})
+	time.Sleep(50 * time.Millisecond)
+
+	// Choose type 1 (autoruns)
+	p.Send(tea.KeyMsg{Type: tea.KeyRunes, Runes: []rune{'1'}})
+	time.Sleep(50 * time.Millisecond)
+
+	// Go back to type picker
+	p.Send(tea.KeyMsg{Type: tea.KeyLeft})
+	time.Sleep(50 * time.Millisecond)
+
+	// Quit
+	p.Send(tea.KeyMsg{Type: tea.KeyRunes, Runes: []rune{'q'}})
+
+	select {
+	case err := <-done:
+		if err != nil {
+			t.Fatalf("program error: %v", err)
+		}
+	case <-time.After(2 * time.Second):
+		t.Fatal("program did not exit in time")
+	}
+}
+
+func TestApp_ErrorOnBadJSON(t *testing.T) {
+	tmp := t.TempDir()
+	if err := os.Chdir(tmp); err != nil {
+		t.Fatalf("chdir: %v", err)
+	}
+	_ = writeTestReport(t, tmp, "bad.json", false)
+
+	p := tea.NewProgram(NewApp(), tea.WithoutRenderer())
+	done := make(chan error, 1)
+	go func() {
+		_, err := p.Run()
+		done <- err
+	}()
+
+	time.Sleep(100 * time.Millisecond)
+	// Select file -> should error
+	p.Send(tea.KeyMsg{Type: tea.KeyEnter})
+	// Any key quits on error screen
+	time.Sleep(50 * time.Millisecond)
+	p.Send(tea.KeyMsg{Type: tea.KeyEsc})
+
+	select {
+	case err := <-done:
+		if err != nil {
+			t.Fatalf("program error: %v", err)
+		}
+	case <-time.After(2 * time.Second):
+		t.Fatal("program did not exit in time")
+	}
+}