feat: add category selection to post edit form and badges to post list

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

handlers/posts.go

@@ -6,11 +6,13 @@ import (
 
 	"github.com/gofiber/fiber/v3"
 	"lmika.dev/lmika/weiro/models"
+	"lmika.dev/lmika/weiro/services/categories"
 	"lmika.dev/lmika/weiro/services/posts"
 )
 
 type PostsHandler struct {
-	PostService *posts.Service
+	PostService     *posts.Service
+	CategoryService *categories.Service
 }
 
 func (ph PostsHandler) Index(c fiber.Ctx) error {
@@ -42,8 +44,15 @@ func (ph PostsHandler) New(c fiber.Ctx) error {
 		State: models.StateDraft,
 	}
 
+	cats, err := ph.CategoryService.ListCategories(c.Context())
+	if err != nil {
+		return err
+	}
+
 	return c.Render("posts/edit", fiber.Map{
-		"post": p,
+		"post":               p,
+		"categories":         cats,
+		"selectedCategories": map[int64]bool{},
 	})
 }
 
@@ -62,11 +71,28 @@ func (ph PostsHandler) Edit(c fiber.Ctx) error {
 		return err
 	}
 
+	cats, err := ph.CategoryService.ListCategories(c.Context())
+	if err != nil {
+		return err
+	}
+
+	postCats, err := ph.PostService.GetPostCategories(c.Context(), postID)
+	if err != nil {
+		return err
+	}
+
+	selectedCategories := make(map[int64]bool)
+	for _, pc := range postCats {
+		selectedCategories[pc.ID] = true
+	}
+
 	return accepts(c, json(func() any {
 		return post
 	}), html(func(c fiber.Ctx) error {
 		return c.Render("posts/edit", fiber.Map{
-			"post": post,
+			"post":               post,
+			"categories":         cats,
+			"selectedCategories": selectedCategories,
 		})
 	}))
 }