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/terminal/issue_form_test.go

@@ -6,8 +6,11 @@ package terminal
 import (
 	"bytes"
 	"context"
+	"io"
 	"path/filepath"
+	"strings"
 	"testing"
+	"time"
 
 	"github.com/stretchr/testify/require"
 )
@@ -28,6 +31,57 @@ func TestCollectIssuePropertiesUsesEditBodyDraft(t *testing.T) {
 	require.NotEmpty(t, values.Draft.Path)
 }
 
+// lineReader returns one line per read, so that each accessible prompt reads only its answer.
+type lineReader struct{ text string }
+
+func (r *lineReader) Read(p []byte) (int, error) {
+	if r.text == "" {
+		return 0, io.EOF
+	}
+	line, _, _ := strings.Cut(r.text, "\n")
+	n := copy(p, line+"\n")
+	r.text = r.text[min(n, len(r.text)):]
+	return n, nil
+}
+
+func TestIssueFormAsksWhatsNextBeforeMetadata(t *testing.T) {
+	choices := IssueFormChoices{AskNext: true, CanPush: true, Assignees: []string{"alice"}, EditBody: noEdit}
+	for _, test := range []struct {
+		name, input string
+		canceled    bool
+	}{
+		{"submit", "Title\n1\n", false},
+		{"cancel", "Title\n3\n", true},
+	} {
+		t.Run(test.name, func(t *testing.T) {
+			t.Setenv("TERM", "dumb")
+			p, rendered := testPrompter(&lineReader{text: test.input})
+			values, err := p.collectIssueProperties(context.Background(), "", "", choices)
+			require.Contains(t, rendered.String(), "What's next?")
+			require.Contains(t, rendered.String(), "Add metadata")
+			require.NotContains(t, rendered.String(), "Assignees:")
+			if test.canceled {
+				require.ErrorIs(t, err, ErrCanceled)
+				return
+			}
+			require.NoError(t, err)
+			require.Equal(t, "Title", values.Title)
+			require.Empty(t, values.Assignees)
+		})
+	}
+	t.Setenv("TERM", "dumb")
+	p, rendered := testPrompter(&lineReader{text: "Title\n2\n1\n0\n2028-01-15\n"})
+	values, err := p.collectIssueProperties(context.Background(), "", "", choices)
+	require.NoError(t, err)
+	require.Contains(t, rendered.String(), "Assignees:")
+	require.Equal(t, []string{"alice"}, values.Assignees)
+	require.Equal(t, "2028-01-15", values.Deadline.Format(time.DateOnly))
+	p, rendered = accessiblePrompter(t, "Title\n")
+	_, err = p.collectIssueProperties(context.Background(), "", "", IssueFormChoices{EditBody: noEdit})
+	require.NoError(t, err)
+	require.NotContains(t, rendered.String(), "What's next?")
+}
+
 func TestIssueFormMarksTitleRequired(t *testing.T) {
 	p, rendered := accessiblePrompter(t, "Title\n")
 	_, err := p.collectIssueProperties(context.Background(), "", "", IssueFormChoices{EditBody: noEdit})