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/issue_edit_form_test.go

@@ -46,6 +46,7 @@ func TestIssueEditImplicitInteractiveForm(t *testing.T) {
 	deps, out, diagnostics := serverDeps(t, server.URL)
 	deps.IssueEditForm = issueEditFormFunc(func(_ context.Context, choices terminal.IssueEditFormChoices) (terminal.IssueEditFormValues, error) {
 		require.NotNil(t, choices.EditBody)
+		require.Equal(t, "Editing alice/project#5 (Old)", choices.Heading)
 		calls++
 		require.Equal(t, "Old", choices.Title)
 		require.Equal(t, "Old body", choices.Body)
@@ -64,7 +65,7 @@ func TestIssueEditImplicitInteractiveForm(t *testing.T) {
 	deps.Streams.InTTY, deps.Streams.ErrTTY = true, true
 	require.NoError(t, Execute(context.Background(), deps, []string{"issue", "edit", "5", "-R", "alice/project", "--json=number,title", "--interactive"}))
 	require.Equal(t, 1, calls)
-	require.Len(t, prompt.confirmations, 1)
+	require.Empty(t, prompt.confirmations)
 	require.Equal(t, "Edited", patchPayload["title"])
 	require.Equal(t, "New body", patchPayload["body"])
 	require.Equal(t, []any{"bob"}, patchPayload["assignees"])