feat(wiki): rename pages with --title alone, page lists on the client

wiki edit P --title New failed with "supply --body": renaming now keeps
the page's content, and edit needs one of --title, --body, --body-file
or --editor. wiki list --limit 1 returned every page because Gitea
replaces a limit of 1 with its default; the page list is now read whole
and paged on the client, so --limit and --page hold and the context line
counts the pages.

wiki create takes the title as an argument and, without --body, asks for
the content in the editor or an inline multi-line field. wiki view shows
the author, last update and revision count above the rendered page, and
--web opens it. wiki list and revisions show headed columns, page names
complete with Tab, and every change reports a ✓ line.

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

internal/app/validation_test.go

@@ -240,7 +240,7 @@ func TestUsageErrorsPrecedeRequests(t *testing.T) {
 		{[]string{"webhook", "delete", "not-an-id"}, "invalid resource number \"not-an-id\""},
 		{[]string{"webhook", "list", "--org", "organization", "--account"}, "--org, --account, --global, and --repo select mutually exclusive scopes"},
 		{[]string{"webhook", "list", "--global", "-R", "owner/repo"}, "--org, --account, --global, and --repo select mutually exclusive scopes"},
-		{[]string{"wiki", "create", "--body-file", "-"}, "--body-file - requires --title"},
+		{[]string{"wiki", "create", "--body-file", "-"}, "--body-file - requires a title"},
 		{[]string{"wiki", "create", "--title", "Home", "--body", "text", "--json=created_at"}, "unknown JSON field \"created_at\""},
 		{[]string{"wiki", "edit", "Home", "--body="}, "wiki content cannot be empty"},
 		{[]string{"wiki", "revisions", "Home", "--page", "0"}, `"--page" flag: must be a positive integer`},
@@ -258,7 +258,6 @@ func TestConfirmationsNameResolvedValues(t *testing.T) {
 		inputs map[string]string
 		want   string
 	}{
-		{[]string{"wiki", "create"}, map[string]string{"title": "Home", "body": "text"}, "create wiki page Home on alice/project"},
 		{[]string{"release", "create"}, map[string]string{"Tag": "v1.0.0"}, "Create release v1.0.0 in alice/project?"},
 		{[]string{"time", "delete", "5", "7"}, nil, "delete tracked time entry 7 on alice/project #5"},
 	} {