bug: error occurred when selected span in log details does not exist

[ymtdzzz]

Currently, selecting a deleted trace id shows strange view.

Blocked by: #84

[ymtdzzz]

The error No spans found should be handled in:

otel-tui/tuiexporter/internal/tui/component/timeline.go

Lines 40 to 47 in 4474345

	func DrawTimeline(traceID string, tcache *telemetry.TraceCache, lcache *telemetry.LogCache, setFocusFn func(p tview.Primitive)) (tview.Primitive, KeyMaps) {
	if traceID == "" || tcache == nil {
	return newTextView("No spans found"), KeyMaps{}
	}
	_, ok := tcache.GetSpansByTraceID(traceID)
	if !ok {
	return newTextView("No spans found"), KeyMaps{}
	}

But to do this, there must be a way to back to the previous page in DrawTimeline() so this issue is blocked by #84 .