refactor: remove features beyond the UX plan

Drop additions that the UX plan does not ask for:

- the interactive label edit form; label edit now requires a flag
- label clone and the skip mode of label creation it needed
- repo rename rewriting the Git remote or tea.repository; it now
  warns that the remote still points to the old name
- the extra "source" remote on clones of pull mirrors
- run artifact download, which duplicates run download --zip
- 256-color and 24-bit label swatches; colors stay ANSI 16
- config list --show-source (config get keeps it)
- the membership and access GETs before team member/repo add and
  remove; Gitea's PUT and DELETE are idempotent

label edit/delete keep --by-name: it is the only way to address a
label whose name is a number that is also another label's ID.

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

internal/app/label_options_test.go

@@ -11,7 +11,6 @@ import (
 	"strings"
 	"testing"
 
-	"gitea.dev/tea/internal/terminal"
 	"github.com/stretchr/testify/require"
 )
 
@@ -96,15 +95,11 @@ func TestLabelsByName(t *testing.T) {
 	labels := `[{"id":11,"name":"bug","color":"ee0701"},{"id":12,"name":"kind/feature","color":"84b6eb","exclusive":true},{"id":13,"name":"2026","color":"cccccc"}]`
 	server := newAuthenticatedServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
 		switch r.Method + " " + r.URL.Path {
-		case "GET /api/v1/repos/alice/project/labels", "GET /api/v1/repos/bob/source/labels":
+		case "GET /api/v1/repos/alice/project/labels":
 			if r.URL.Query().Get("page") != "1" {
 				_, _ = w.Write([]byte(`[]`))
 				return
 			}
-			if r.URL.Path == "/api/v1/repos/bob/source/labels" {
-				_, _ = w.Write([]byte(`[{"id":1,"name":"bug","color":"000000"},{"id":2,"name":"docs","color":"0000ff","description":"Docs"}]`))
-				return
-			}
 			_, _ = w.Write([]byte(labels))
 		default:
 			changed = append(changed, r.Method+" "+r.URL.Path+" "+requestFields(t, r, "name", "color", "description"))
@@ -131,15 +126,12 @@ func TestLabelsByName(t *testing.T) {
 	require.NoError(t, run("label", "edit", "2026", "--by-name", "-d", "Year"))
 	require.NoError(t, run("label", "delete", "BUG", "12", "--yes"))
 	require.Equal(t, "✓ Deleted label \"bug\" from alice/project\n✓ Deleted label \"kind/feature\" from alice/project\n", diagnostics.String())
-	require.NoError(t, run("label", "clone", "bob/source"))
-	require.Equal(t, "! Skipped label \"bug\" in alice/project: it exists already\n✓ Created label \"docs\" in alice/project\n", diagnostics.String())
 	require.Equal(t, []string{
 		"POST /api/v1/repos/alice/project/labels name=docs color=0000FF description=Docs",
 		"PATCH /api/v1/repos/alice/project/labels/12 name=kind/enhancement color=<nil> description=<nil>",
 		"PATCH /api/v1/repos/alice/project/labels/13 name=<nil> color=<nil> description=Year",
 		"DELETE /api/v1/repos/alice/project/labels/11 ",
 		"DELETE /api/v1/repos/alice/project/labels/12 ",
-		"POST /api/v1/repos/alice/project/labels name=docs color=0000ff description=Docs",
 	}, changed)
 	for _, test := range []struct {
 		args []string
@@ -194,45 +186,3 @@ func TestLabelCreatePicksAColorAndPrompts(t *testing.T) {
 	require.Equal(t, "From a prompt", created[1]["description"])
 	require.Equal(t, []string{"Label name", "Color (hex, e.g. d73a4a; empty = random):", "Description (optional):"}, prompt.asked)
 }
-
-// labelFormPrompter answers the label form with edit applied to the current values.
-type labelFormPrompter struct {
-	scriptedPrompter
-	heading string
-	edit    func(*terminal.LabelFormValues)
-}
-
-func (p *labelFormPrompter) EditLabel(_ context.Context, heading string, current terminal.LabelFormValues) (terminal.LabelFormValues, error) {
-	p.heading = heading
-	p.edit(&current)
-	return current, nil
-}
-
-func TestLabelEditFormStartsFromTheLabel(t *testing.T) {
-	var edited string
-	server := newAuthenticatedServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
-		switch r.Method + " " + r.URL.Path {
-		case "GET /api/v1/repos/alice/project/labels":
-			if r.URL.Query().Get("page") != "1" {
-				_, _ = w.Write([]byte(`[]`))
-				return
-			}
-			_, _ = w.Write([]byte(`[{"id":11,"name":"bug","color":"ee0701","description":"Broken"}]`))
-		case "PATCH /api/v1/repos/alice/project/labels/11":
-			edited = requestFields(t, r, "name", "color", "description", "exclusive")
-			_, _ = w.Write([]byte(`{"id":11,"name":"defect"}`))
-		default:
-			t.Errorf("unexpected %s %s", r.Method, r.URL.Path)
-		}
-	}))
-	defer server.Close()
-	deps, _, _ := serverDeps(t, server.URL)
-	deps.Streams.InTTY, deps.Streams.ErrTTY = true, true
-	prompt := &labelFormPrompter{edit: func(v *terminal.LabelFormValues) { v.Name, v.Exclusive = "defect", true }}
-	deps.Prompter = prompt
-	require.NoError(t, Execute(context.Background(), deps, []string{"label", "edit", "bug", "-R", "alice/project"}))
-	require.Equal(t, `Editing label "bug" in alice/project`, prompt.heading)
-	require.Equal(t, "name=defect color=ee0701 description=Broken exclusive=true", edited)
-	deps.Streams.InTTY, deps.Streams.ErrTTY = false, false
-	require.ErrorIs(t, Execute(context.Background(), deps, []string{"label", "edit", "bug", "-R", "alice/project"}), errNothingToEdit)
-}