feat: rename/relocate a profile's SQLite logbook (QSOs carried across)

"Choose a dedicated file" points at a fresh/empty file; there was no way to
rename or move an existing logbook WITH its data. RenameLogbook VACUUM INTOs the
active profile's SQLite logbook to a new path, repoints the profile and switches
the live logbook (no restart). Deletes the old file only when it was a dedicated
per-profile file; the shared default logbook.db is left for other profiles.
Errors on a MySQL logbook. UI: "Rename / relocate…" button in the logbook section.

app.go

@@ -1806,6 +1806,61 @@ func (a *App) SaveMySQLSettings(s MySQLSettings) error {
 	return a.switchLogbook(p)
 }
 
+// RenameLogbook copies the ACTIVE profile's SQLite logbook to dest (with its
+// QSOs), repoints the profile at it and switches the live logbook — no restart.
+// Unlike "choose a dedicated file" (which points at a fresh/empty file), this
+// carries the data across. The old file is deleted only when it was this
+// profile's OWN dedicated file; the shared default logbook.db is left in place
+// (other profiles may use it). Errors if the logbook is MySQL.
+func (a *App) RenameLogbook(dest string) error {
+	dest = strings.TrimSpace(dest)
+	if dest == "" {
+		return fmt.Errorf("no destination given")
+	}
+	p, err := a.profiles.Active(a.ctx)
+	if err != nil {
+		return fmt.Errorf("no active profile: %w", err)
+	}
+	if p.DB.Backend == "mysql" {
+		return fmt.Errorf("this profile's logbook is MySQL — no file to rename")
+	}
+	old := strings.TrimSpace(p.DB.Path)
+	wasDedicated := old != ""
+	if old == "" {
+		old = a.logbookPath
+	}
+	if old == "" || a.logDb == nil {
+		return fmt.Errorf("no logbook file to rename")
+	}
+	if strings.EqualFold(filepath.Clean(dest), filepath.Clean(old)) {
+		return fmt.Errorf("that is already the current logbook name")
+	}
+	if _, err := os.Stat(dest); err == nil {
+		return fmt.Errorf("a file already exists at %s — pick a new name", dest)
+	}
+	if err := os.MkdirAll(filepath.Dir(dest), 0o755); err != nil {
+		return fmt.Errorf("create folder: %w", err)
+	}
+	safe := strings.ReplaceAll(dest, "'", "''")
+	if _, err := a.logDb.ExecContext(a.ctx, "VACUUM INTO '"+safe+"'"); err != nil {
+		return fmt.Errorf("copy logbook: %w", err)
+	}
+	p.DB.Backend = "sqlite"
+	p.DB.Path = dest
+	if err := a.profiles.SetDB(a.ctx, p.ID, p.DB); err != nil {
+		return err
+	}
+	if err := a.switchLogbook(p); err != nil { // opens dest, closes the old conn
+		return err
+	}
+	if wasDedicated {
+		for _, f := range []string{old, old + "-wal", old + "-shm"} {
+			_ = os.Remove(f)
+		}
+	}
+	return nil
+}
+
 // TestMySQLConnection pings the shared MySQL database with the given settings
 // (no migrations) so the user can validate connectivity from the UI.
 func (a *App) TestMySQLConnection(s MySQLSettings) error {