feat(milestone): milestone tables, views, forms and one selection model

milestone view printed the list row, and milestone list hid the due date
and progress. milestone list now shows ID TITLE [STATE] DUE PROGRESS, open
milestones first and by due date; milestone view shows the state, due
date, progress, description and the milestone's web page (also --web).

Every milestone command addresses milestones by title or ID. Mutations
report ✓ lines: milestone create also prints the new milestone's URL and
takes the title as an argument; close and reopen skip milestones already
in that state; delete names the milestone in its confirmation; milestone
issue add and remove report one line such as "✓ Added #1, #2 to
milestone "v1.0" in alice/x". milestone issue list uses the issue table.
milestone edit without flags on a terminal opens the milestone form with
the current values, and every milestone command completes milestone
titles and has help text with examples.

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

internal/terminal/milestone_form.go

@@ -11,25 +11,30 @@ import (
 	"charm.land/huh/v2"
 )
 
-// MilestoneFormValues holds interactively collected milestone create fields.
+// MilestoneFormValues holds interactively collected milestone fields.
 type MilestoneFormValues struct {
 	Title, Description string
 	Deadline           *time.Time
 }
 
-// MilestoneForm collects interactive milestone create input.
+// MilestoneForm collects interactive milestone input.
 type MilestoneForm interface {
-	CreateMilestone(context.Context) (MilestoneFormValues, error)
+	// EditMilestone asks for the fields of a milestone, starting from current, under heading, such
+	// as "Editing milestone v1.0". Empty values create a milestone.
+	EditMilestone(ctx context.Context, heading string, current MilestoneFormValues) (MilestoneFormValues, error)
 }
 
-// CreateMilestone runs the interactive milestone create form on stderr.
-func (p *FormPrompter) CreateMilestone(ctx context.Context) (MilestoneFormValues, error) {
-	title, description, deadline := "", "", ""
+// EditMilestone runs the interactive milestone form on stderr.
+func (p *FormPrompter) EditMilestone(ctx context.Context, heading string, current MilestoneFormValues) (MilestoneFormValues, error) {
+	title, description, deadline := current.Title, current.Description, ""
+	if current.Deadline != nil {
+		deadline = current.Deadline.Format(time.DateOnly)
+	}
 	if err := p.runForm(ctx, huh.NewForm(huh.NewGroup(
 		huh.NewInput().Title("Milestone title (required):").Value(&title).Validate(huh.ValidateNotEmpty()),
-		huh.NewText().Title("Milestone description (markdown):").Value(&description),
+		bodyField("Milestone description (markdown):", &description),
 		dueDateInput("Milestone deadline:", &deadline),
-	))); err != nil {
+	).Title(heading))); err != nil {
 		return MilestoneFormValues{}, err
 	}
 	parsed, err := parseDueDate(deadline)

internal/terminal/milestone_form_test.go

@@ -5,14 +5,26 @@ package terminal
 
 import (
 	"context"
+	"strings"
 	"testing"
+	"time"
 
 	"github.com/stretchr/testify/require"
 )
 
 func TestMilestoneFormMarksTitleRequired(t *testing.T) {
 	p, rendered := accessiblePrompter(t, "v1\n\n\n")
-	_, err := p.CreateMilestone(context.Background())
+	_, err := p.EditMilestone(context.Background(), "", MilestoneFormValues{})
 	require.NoError(t, err)
 	require.Contains(t, rendered.String(), "Milestone title (required):")
 }
+
+func TestMilestoneFormStartsFromCurrentValues(t *testing.T) {
+	due := time.Date(2026, 12, 31, 0, 0, 0, 0, time.UTC)
+	p, _ := testPrompter(strings.NewReader("\r\r\r"))
+	values, err := p.EditMilestone(context.Background(), "Editing milestone v1.0", MilestoneFormValues{Title: "v1.0", Description: "First", Deadline: &due})
+	require.NoError(t, err)
+	require.Equal(t, "v1.0", values.Title)
+	require.Equal(t, "First", values.Description)
+	require.Equal(t, due, *values.Deadline)
+}