Allow editing time entry start and end in TUI and web.

Duration is derived from the range so timer sessions can be corrected after the fact.

Co-authored-by: Cursor <cursoragent@cursor.com>

internal/ui/views/timeentries.go

@@ -97,7 +97,7 @@ func (v TimeEntriesView) View() string {
 		title = "ticket"
 	}
 	head := v.Styles.Title.Render(fmt.Sprintf("Time entries · %s", truncateOneLine(title, max(8, v.Width-20))))
-	hint := v.Styles.Hint.Render("j/k navigate · e edit · x delete · esc back")
+	hint := v.Styles.Hint.Render("j/k navigate · e edit start/end · x delete · esc back")
 
 	innerW := max(20, v.Width-2)
 	var lines []string