feat(pulls): add ci status field to pull request list (#956)

## Summary

- Add `"ci"` as a new selectable field for `tea pr list --fields`, allowing users to see CI status across multiple PRs at a glance
- Fetch CI status via `GetCombinedStatus` API **only when the `ci` field is explicitly requested** via `--fields`, avoiding unnecessary API calls in default usage
- Improve CI status display in both detail and list views:
  - **Detail view** (`tea pr <index>`): show each CI check with symbol, context name, description, and clickable link to CI run
  - **List view** (`tea pr list --fields ci`): show symbol + context name per CI check (e.g., `✓ lint, ⏳ build, ❌ test`)
  - **Machine-readable output**: return raw state string (e.g., `success`, `pending`)
- Replace pending CI symbol from `⭮` to `⏳` for better readability
- Extract `formatCIStatus` helper and reuse it in `PullDetails` to reduce code duplication
- Add comprehensive tests for CI status formatting and PR list integration

## Detail View Example

```
- CI:
  - ✓ [**lint**](https://ci.example.com/lint): Lint passed
  - ⏳ [**build**](https://ci.example.com/build): Build is running
  - ❌ [**test**](https://ci.example.com/test): 3 tests failed
```

## List View Example

```
INDEX  TITLE       STATE  CI
123    Fix bug     open   ✓ lint, ⏳ build, ❌ test
```

## Usage

```bash
# Show CI status column in list
tea pr list --fields index,title,state,ci

# Default output is unchanged (no CI column, no extra API calls)
tea pr list
```

## Files Changed

- `cmd/pulls/list.go` — conditionally fetch CI status per PR when `ci` field is selected
- `modules/print/pull.go` — add `ci` field, `formatCIStatus` helper, improve detail/list CI display
- `modules/print/pull_test.go` — comprehensive tests for CI status formatting

## Test plan

- [x] `go build ./...` passes
- [x] `go test ./...` passes (11 new tests)
- [x] `tea pr list` — default output unchanged, no extra API calls
- [x] `tea pr list --fields index,title,state,ci` — CI column with context names
- [x] `tea pr <index>` — CI section shows each check with name, description, and link
- [x] `tea pr list --fields ci -o csv` — machine-readable output shows raw state strings

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Reviewed-on: https://gitea.com/gitea/tea/pulls/956
Reviewed-by: Lunny Xiao <xiaolunwen@gmail.com>
Co-authored-by: Bo-Yi Wu <appleboy.tw@gmail.com>
Co-committed-by: Bo-Yi Wu <appleboy.tw@gmail.com>

modules/print/pull_test.go

@@ -0,0 +1,189 @@
+// Copyright 2026 The Gitea Authors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
+package print
+
+import (
+	"bytes"
+	"encoding/json"
+	"slices"
+	"testing"
+	"time"
+
+	"code.gitea.io/sdk/gitea"
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+)
+
+func newTestPR(index int64, title string) *gitea.PullRequest {
+	now := time.Now()
+	return &gitea.PullRequest{
+		Index:   index,
+		Title:   title,
+		State:   gitea.StateOpen,
+		Poster:  &gitea.User{UserName: "testuser"},
+		Head:    &gitea.PRBranchInfo{Ref: "branch", Name: "branch"},
+		Base:    &gitea.PRBranchInfo{Ref: "main", Name: "main"},
+		Created: &now,
+		Updated: &now,
+	}
+}
+
+func TestFormatCIStatusNil(t *testing.T) {
+	assert.Equal(t, "", formatCIStatus(nil, false))
+	assert.Equal(t, "", formatCIStatus(nil, true))
+}
+
+func TestFormatCIStatusEmpty(t *testing.T) {
+	ci := &gitea.CombinedStatus{Statuses: []*gitea.Status{}}
+	assert.Equal(t, "", formatCIStatus(ci, false))
+	assert.Equal(t, "", formatCIStatus(ci, true))
+}
+
+func TestFormatCIStatusMachineReadable(t *testing.T) {
+	ci := &gitea.CombinedStatus{
+		State: gitea.StatusSuccess,
+		Statuses: []*gitea.Status{
+			{State: gitea.StatusSuccess, Context: "lint"},
+		},
+	}
+	assert.Equal(t, "success", formatCIStatus(ci, true))
+
+	ci.State = gitea.StatusPending
+	ci.Statuses = []*gitea.Status{
+		{State: gitea.StatusPending, Context: "build"},
+	}
+	assert.Equal(t, "pending", formatCIStatus(ci, true))
+}
+
+func TestFormatCIStatusSingle(t *testing.T) {
+	ci := &gitea.CombinedStatus{
+		State: gitea.StatusSuccess,
+		Statuses: []*gitea.Status{
+			{State: gitea.StatusSuccess, Context: "lint"},
+		},
+	}
+	assert.Equal(t, "✓ lint", formatCIStatus(ci, false))
+}
+
+func TestFormatCIStatusMultiple(t *testing.T) {
+	ci := &gitea.CombinedStatus{
+		State: gitea.StatusFailure,
+		Statuses: []*gitea.Status{
+			{State: gitea.StatusSuccess, Context: "lint"},
+			{State: gitea.StatusPending, Context: "build"},
+			{State: gitea.StatusFailure, Context: "test"},
+		},
+	}
+	assert.Equal(t, "✓ lint, ⏳ build, ❌ test", formatCIStatus(ci, false))
+}
+
+func TestFormatCIStatusAllStates(t *testing.T) {
+	tests := []struct {
+		state    gitea.StatusState
+		context  string
+		expected string
+	}{
+		{gitea.StatusSuccess, "s", "✓ s"},
+		{gitea.StatusPending, "p", "⏳ p"},
+		{gitea.StatusWarning, "w", "⚠ w"},
+		{gitea.StatusError, "e", "✘ e"},
+		{gitea.StatusFailure, "f", "❌ f"},
+	}
+	for _, tt := range tests {
+		ci := &gitea.CombinedStatus{
+			State:    tt.state,
+			Statuses: []*gitea.Status{{State: tt.state, Context: tt.context}},
+		}
+		assert.Equal(t, tt.expected, formatCIStatus(ci, false), "state: %s", tt.state)
+	}
+}
+
+func TestPullsListWithCIField(t *testing.T) {
+	prs := []*gitea.PullRequest{
+		newTestPR(1, "feat: add feature"),
+		newTestPR(2, "fix: bug fix"),
+	}
+
+	ciStatuses := map[int64]*gitea.CombinedStatus{
+		1: {
+			State: gitea.StatusSuccess,
+			Statuses: []*gitea.Status{
+				{State: gitea.StatusSuccess, Context: "ci/build"},
+			},
+		},
+		2: {
+			State: gitea.StatusFailure,
+			Statuses: []*gitea.Status{
+				{State: gitea.StatusFailure, Context: "ci/test"},
+			},
+		},
+	}
+
+	buf := &bytes.Buffer{}
+	tbl := tableFromItems(
+		[]string{"index", "ci"},
+		[]printable{
+			&printablePull{prs[0], &map[int64]string{}, &ciStatuses},
+			&printablePull{prs[1], &map[int64]string{}, &ciStatuses},
+		},
+		true,
+	)
+	require.NoError(t, tbl.fprint(buf, "json"))
+
+	var result []map[string]string
+	require.NoError(t, json.Unmarshal(buf.Bytes(), &result))
+	require.Len(t, result, 2)
+	assert.Equal(t, "1", result[0]["index"])
+	assert.Equal(t, "success", result[0]["ci"])
+	assert.Equal(t, "2", result[1]["index"])
+	assert.Equal(t, "failure", result[1]["ci"])
+}
+
+func TestPullsListCIFieldEmpty(t *testing.T) {
+	prs := []*gitea.PullRequest{newTestPR(1, "no ci")}
+	ciStatuses := map[int64]*gitea.CombinedStatus{}
+
+	buf := &bytes.Buffer{}
+	tbl := tableFromItems(
+		[]string{"index", "ci"},
+		[]printable{
+			&printablePull{prs[0], &map[int64]string{}, &ciStatuses},
+		},
+		true,
+	)
+	require.NoError(t, tbl.fprint(buf, "json"))
+
+	var result []map[string]string
+	require.NoError(t, json.Unmarshal(buf.Bytes(), &result))
+	require.Len(t, result, 1)
+	assert.Equal(t, "", result[0]["ci"])
+}
+
+func TestPullsListNilCIStatusesWithCIField(t *testing.T) {
+	prs := []*gitea.PullRequest{newTestPR(1, "nil ci")}
+
+	buf := &bytes.Buffer{}
+	tbl := tableFromItems(
+		[]string{"index", "ci"},
+		[]printable{
+			&printablePull{prs[0], &map[int64]string{}, nil},
+		},
+		true,
+	)
+	require.NoError(t, tbl.fprint(buf, "json"))
+
+	var result []map[string]string
+	require.NoError(t, json.Unmarshal(buf.Bytes(), &result))
+	require.Len(t, result, 1)
+	assert.Equal(t, "", result[0]["ci"])
+}
+
+func TestPullsListNoCIFieldNoPanic(t *testing.T) {
+	prs := []*gitea.PullRequest{newTestPR(1, "test")}
+	require.NoError(t, PullsList(prs, "", []string{"index", "title"}, nil))
+}
+
+func TestPullFieldsContainsCI(t *testing.T) {
+	assert.True(t, slices.Contains(PullFields, "ci"), "PullFields should contain 'ci'")
+}