CRITICAL FIX: Eliminate all hardcoded /tmp paths - respect WorkDir configuration

This is a critical bugfix release addressing multiple hardcoded temporary directory paths
that prevented proper use of the WorkDir configuration option.

PROBLEM:
Users configuring WorkDir (e.g., /u01/dba/tmp) for systems with small root filesystems
still experienced failures because critical operations hardcoded /tmp instead of respecting
the configured WorkDir. This made the WorkDir option essentially non-functional.

FIXED LOCATIONS:
1. internal/restore/engine.go:632 - CRITICAL: Used BackupDir instead of WorkDir for extraction
2. cmd/restore.go:354,834 - CLI restore/diagnose commands ignored WorkDir
3. cmd/migrate.go:208,347 - Migration commands hardcoded /tmp
4. internal/migrate/engine.go:120 - Migration engine ignored WorkDir
5. internal/config/config.go:224 - SwapFilePath hardcoded /tmp
6. internal/config/config.go:519 - Backup directory fallback hardcoded /tmp
7. internal/tui/restore_exec.go:161 - Debug logs hardcoded /tmp
8. internal/tui/settings.go:805 - Directory browser default hardcoded /tmp
9. internal/tui/restore_preview.go:474 - Display message hardcoded /tmp

NEW FEATURES:
- Added Config.GetEffectiveWorkDir() helper method
- WorkDir now respects WORK_DIR environment variable
- All temp operations now consistently use configured WorkDir with /tmp fallback

IMPACT:
- Restores on systems with small root disks now work properly with WorkDir configured
- Admins can control disk space usage for all temporary operations
- Debug logs, extraction dirs, swap files all respect WorkDir setting

Version: 3.42.1 (Critical Fix Release)

internal/tui/restore_exec.go

@@ -4,6 +4,7 @@ import (
 	"context"
 	"fmt"
 	"os/exec"
+	"path/filepath"
 	"strings"
 	"time"
 
@@ -157,8 +158,9 @@ func executeRestoreWithTUIProgress(parentCtx context.Context, cfg *config.Config
 
 		// Enable debug logging if requested
 		if saveDebugLog {
-			// Generate debug log path based on archive name and timestamp
-			debugLogPath := fmt.Sprintf("/tmp/dbbackup-restore-debug-%s.json", time.Now().Format("20060102-150405"))
+			// Generate debug log path using configured WorkDir
+			workDir := cfg.GetEffectiveWorkDir()
+			debugLogPath := filepath.Join(workDir, fmt.Sprintf("dbbackup-restore-debug-%s.json", time.Now().Format("20060102-150405")))
 			engine.SetDebugLogPath(debugLogPath)
 			log.Info("Debug logging enabled", "path", debugLogPath)
 		}

internal/tui/restore_preview.go

@@ -471,7 +471,7 @@ func (m RestorePreviewModel) View() string {
 	s.WriteString(debugStyle.Render(fmt.Sprintf("  %s Debug Log: %v (press 'd' to toggle)", debugIcon, m.saveDebugLog)))
 	s.WriteString("\n")
 	if m.saveDebugLog {
-		s.WriteString(infoStyle.Render("    Saves detailed error report to /tmp on failure"))
+		s.WriteString(infoStyle.Render(fmt.Sprintf("    Saves detailed error report to %s on failure", m.config.GetEffectiveWorkDir())))
 		s.WriteString("\n")
 	}
 	s.WriteString("\n")

internal/tui/settings.go

@@ -802,7 +802,7 @@ func (m SettingsModel) openDirectoryBrowser() (tea.Model, tea.Cmd) {
 	setting := m.settings[m.cursor]
 	currentValue := setting.Value(m.config)
 	if currentValue == "" {
-		currentValue = "/tmp"
+		currentValue = m.config.GetEffectiveWorkDir()
 	}
 
 	if m.dirBrowser == nil {