feat(time): readable time tables with totals and gh-style feedback

time list printed Go durations (1h30m0s), raw timestamps and no issue
title. It now shows ID ISSUE USER SPENT WHEN with "#1 Login fails",
"1h 30m" and relative times on a terminal, followed by the total of the
listed time, and points at --mine when no repository is selected.
--issue takes issue URLs, --username takes @me, and --since replaces
--from, which still works.

time create (also add and log) reports "✓ Logged 1h 25m on alice/x#1
(title)"; time delete and reset name the time they delete in their
confirmation and ✓ line. Time records gain an issue_title JSON field.

Signed-off-by: bircni <bircni@icloud.com>

internal/app/app_test.go

@@ -432,14 +432,9 @@ const (
 	pr attachment view
 	search issue
 	search pr
-	time create
-	time delete
-	time list
-	time reset
 `
 	longsToWrite = `
 	issue attachment
 	pr attachment
-	time
 `
 )