refactor: add terminal output and forms package (#1124)

- `internal/terminal`: streams and the prompting policy, interactive forms (issue, PR, review, merge, milestone), editor / pager / browser launching, JSON and `--jq` output.
- An aligned table renderer and a record renderer for human output; both strip control and escape characters from server-supplied text so titles and bodies cannot inject terminal sequences.

Reviewed-on: https://gitea.com/gitea/tea/pulls/1124
Reviewed-by: TheFox0x7 <95654+thefox0x7@noreply.gitea.com>

internal/terminal/issue_form_test.go

@@ -0,0 +1,36 @@
+// Copyright 2026 The Gitea Authors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
+package terminal
+
+import (
+	"bytes"
+	"context"
+	"path/filepath"
+	"testing"
+
+	"github.com/stretchr/testify/require"
+)
+
+func TestCollectIssuePropertiesUsesEditBodyDraft(t *testing.T) {
+	var initial string
+	p, _ := testPrompter(bytes.NewBufferString("Drafted Title\r"))
+	values, err := p.collectIssueProperties(context.Background(), "", "template body", IssueFormChoices{
+		EditBody: func(_ context.Context, body string) (Draft, error) {
+			initial = body
+			return Draft{Path: filepath.Join(t.TempDir(), "draft.md"), Body: "edited body"}, nil
+		},
+	})
+	require.NoError(t, err)
+	require.Equal(t, "template body", initial)
+	require.Equal(t, "Drafted Title", values.Title)
+	require.Equal(t, "edited body", values.Body)
+	require.NotEmpty(t, values.Draft.Path)
+}
+
+func TestIssueFormMarksTitleRequired(t *testing.T) {
+	p, rendered := accessiblePrompter(t, "Title\n")
+	_, err := p.collectIssueProperties(context.Background(), "", "", IssueFormChoices{EditBody: noEdit})
+	require.NoError(t, err)
+	require.Contains(t, rendered.String(), "Issue title (required):")
+}