feat(issue): gh-style issue list, view, create, edit, close and reopen

issue list renders through the shared table: a context line, ID TITLE
LABELS [STATE] [KIND] AUTHOR UPDATED with relative times on a terminal,
the ID colored by state and linked, and a stable tab-separated column
set when piped; empty results say so on stderr. It gains -s -L -l -a -A
-m -S -w, @me, comma-separated label and milestone filters, and --web.

issue view, edit, close and reopen accept #N, OWNER/REPO#N and issue
URLs. Mutations report "✓ Created/Edited/Closed issue alice/x#5 (title)"
on a terminal; issue create prints the new issue's URL on stdout (also
as issue new), and close and reopen skip issues already in that state
with a ! line and take -c/--comment. issue create and edit gain the gh
short flags and singular --add-label, --remove-label, --add-assignee and
--remove-assignee (the plural names still work), and create gains --web.

The interactive create form asks for the title and body, then "What's
next?" (submit, add metadata or cancel), without a confirmation after
it; the edit form names the issue it edits. Every issue command has help
text with examples and completes its flags and issue numbers.

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

internal/app/human_output_test.go

@@ -78,7 +78,7 @@ func TestIssueListRespectsColorNeverAndStillPages(t *testing.T) {
 	}))
 	defer server.Close()
 	deps, out, _, pager := pagedDeps(t, server.URL, nil, "color", "never", "pager", "configured-pager")
-	require.NoError(t, Execute(context.Background(), deps, []string{"issue", "list", "-R", "alice/project", "--no-input"}))
+	require.NoError(t, Execute(context.Background(), deps, []string{"issue", "list", "-R", "alice/project", "--state", "all", "--no-input"}))
 	require.Equal(t, 1, pager.calls)
 	require.Equal(t, "configured-pager", pager.command)
 	require.NotContains(t, pager.input, "\x1b[")
@@ -172,9 +172,8 @@ func TestMultiItemHumanOutputPagesOnce(t *testing.T) {
 		args []string
 		want string
 	}{
-		{[]string{"milestone", "issue", "list", "3"}, "1  Issue 1  closed\n2  Issue 2  closed\n"},
-		{[]string{"issue", "close", "1", "2"}, "1  Issue 1  closed\n2  Issue 2  closed\n"},
 		{[]string{"branch", "list"}, "Showing 2 of 2 branches in alice/project\n\nNAME            COMMIT  PROTECTED  UPDATED  MESSAGE\nmain (default)  abc\ndev             def\n"},
+		{[]string{"milestone", "issue", "list", "3"}, "1  Issue 1    closed  issue\n2  Issue 2    closed  issue\n"},
 		{[]string{"issue", "comment", "list", "5"}, "1 alice\none\n\n2 bob\ntwo\n\n"},
 	} {
 		t.Run(tc.args[0]+" "+tc.args[1], func(t *testing.T) {
@@ -224,21 +223,27 @@ func TestListsFitTheTerminalAndSplitWhenPiped(t *testing.T) {
 			`{"number":5,"title":"支持中文路径 (support CJK paths)","state":"open","user":{"login":""}}]`))
 	}))
 	defer server.Close()
-	for _, group := range []string{"issue"} {
+	for group, want := range map[string][2]string{
+		"issue": {
+			"6\tA very long issue title that keeps going and going to see how list output handles wrapping\t\topen\tissue\talice\t\n" +
+				"5\t支持中文路径 (support CJK paths)\t\topen\tissue\t\t\n",
+			"Showing 2 of 2 open issues in alice/project\n\n" +
+				"ID  TITLE                  LABELS  AUTHOR  UPDATED\n" +
+				"#6  A very long issue ti…          alice\n" +
+				"#5  支持中文路径 (suppor…\n",
+		},
+	} {
 		t.Run(group, func(t *testing.T) {
 			deps, out, _ := serverDeps(t, server.URL)
 			args := []string{group, "list", "-R", "alice/project"}
 			require.NoError(t, Execute(context.Background(), deps, args))
-			require.Equal(t, "6\tA very long issue title that keeps going and going to see how list output handles wrapping\topen\talice\n"+
-				"5\t支持中文路径 (support CJK paths)\topen\t\n", out.String())
+			require.Equal(t, want[0], out.String())
 
 			out.Reset()
 			deps.Streams.OutTTY, deps.Streams.Width = true, 50
 			deps.Getenv = serverEnv(server.URL, map[string]string{"NO_COLOR": "1"})
 			require.NoError(t, Execute(context.Background(), deps, args))
-			require.Equal(t, "ID  TITLE                            STATE  AUTHOR\n"+
-				"#6  A very long issue title that k…  open   alice\n"+
-				"#5  支持中文路径 (support CJK path…  open\n", stripLinks(out.String()))
+			require.Equal(t, want[1], stripLinks(out.String()))
 			for _, line := range strings.Split(strings.TrimSpace(out.String()), "\n") {
 				require.LessOrEqual(t, runewidth.StringWidth(stripLinks(line)), 50, line)
 			}