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/services/issues.go

@@ -36,7 +36,7 @@ type Issue struct {
 // Kinds of Issue: Gitea lists pull requests among issues.
 const (
 	KindIssue = "issue"
-	KindPull  = "pull"
+	KindPull  = "pr"
 )
 
 // discussionFrom converts an issue or a pull request listed among issues; the state of a merged
@@ -96,9 +96,15 @@ func (s Issues) endpoint() string { return "repos/" + s.Repository + "/issues" }
 // List returns a page of issues, even when the server caps its page size below the limit,
 // and reports whether more issues follow.
 func (s Issues) List(ctx context.Context, opts ListOptions) ([]Issue, bool, error) {
+	page, err := s.ListPage(ctx, opts)
+	return page.Items, page.More, err
+}
+
+// ListPage is List with the number of issues that match, as the server counts them.
+func (s Issues) ListPage(ctx context.Context, opts ListOptions) (Page[Issue], error) {
 	owner, repo, err := splitRepository(s.Repository)
 	if err != nil {
-		return nil, false, err
+		return Page[Issue]{}, err
 	}
 	kind := "issues"
 	if opts.Kind != "" {
@@ -115,7 +121,7 @@ func (s Issues) List(ctx context.Context, opts ListOptions) ([]Issue, bool, erro
 	if opts.Before != nil {
 		query.Before = *opts.Before
 	}
-	issues, more, err := listWindow(opts.Limit, opts.Page, func(limit, page int) ([]*gitea.Issue, http.Header, error) {
+	issues, err := listPage(opts.Limit, opts.Page, func(limit, page int) ([]*gitea.Issue, http.Header, error) {
 		query.ListOptions = listOptions(limit, page)
 		issues, resp, err := call(ctx, s.Client, func(ctx context.Context, c *gitea.Client) ([]*gitea.Issue, *gitea.Response, error) {
 			return c.Issues.ListRepoIssues(ctx, owner, repo, query)
@@ -123,9 +129,9 @@ func (s Issues) List(ctx context.Context, opts ListOptions) ([]Issue, bool, erro
 		return issues, headerOf(resp), err
 	})
 	if err != nil {
-		return nil, false, err
+		return Page[Issue]{}, err
 	}
-	return convertAll(issues, discussionFrom), more, nil
+	return Page[Issue]{Items: convertAll(issues.Items, discussionFrom), More: issues.More, Total: issues.Total, Counted: issues.Counted}, nil
 }
 
 // filterValues splits a comma-separated filter, which the SDK joins again.