Make the post form's tag input a box with a folded list of chips

A checkbox per existing tag stops working once a blog has dozens of
them. The form is now one comma-separated box, prefilled with the
post's tags, and the blog's tags sit folded under it as chips; a small
script toggles a clicked chip in the box, and without it the chips are
a plain list to copy from.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Sd8UPWrvyYCLj97JexNw3A

1 files changed, 3 insertions, 4 deletions

diff --git a/internal/web/handlers_posts.go b/internal/web/handlers_posts.go
index 16d9cf2..ad0a241 100644
--- a/internal/web/handlers_posts.go
+++ b/internal/web/handlers_posts.go
@@ -69,7 +69,7 @@ func (s *Server) handlePostForm(w http.ResponseWriter, r *http.Request) {
 	} else if hp, err := blogStore(r).HomePage(r.Context()); err == nil {
 		p.PageID = hp.ID
 	}
-	s.render(w, r, "dashboard/post_form.html", map[string]any{"post": p, "pages": pages, "allTags": allTags, "tagged": tagSet(p.Tags), "newTags": ""})
+	s.render(w, r, "dashboard/post_form.html", map[string]any{"post": p, "pages": pages, "allTags": allTags, "tagsText": tagsText(p.Tags)})
 }
 
 func (s *Server) handlePostSave(w http.ResponseWriter, r *http.Request) {
@@ -95,8 +95,7 @@ func (s *Server) handlePostSave(w http.ResponseWriter, r *http.Request) {
 	p.BodyMD = strings.ReplaceAll(r.FormValue("body"), "\r\n", "\n")
 	p.Published = r.FormValue("published") == "on"
 	p.PageID, _ = strconv.ParseInt(r.FormValue("page_id"), 10, 64)
-	// The ticked existing tags and the comma-separated new ones are one list.
-	tags, tagsOK := parseTags(append(r.Form["tag"], strings.Split(r.FormValue("new_tags"), ",")...))
+	tags, tagsOK := parseTags(strings.Split(r.FormValue("tags"), ","))
 	p.Tags = tags
 	autoSlug := p.Slug == ""
 	if autoSlug {
@@ -104,7 +103,7 @@ func (s *Server) handlePostSave(w http.ResponseWriter, r *http.Request) {
 	}
 	fail := func(status int, msg string) {
 		s.renderStatus(w, r, status, "dashboard/post_form.html", map[string]any{"post": p, "pages": pages, "error": msg,
-			"allTags": allTags, "tagged": tagSet(p.Tags), "newTags": r.FormValue("new_tags")})
+			"allTags": allTags, "tagsText": r.FormValue("tags")})
 	}
 	if at := strings.TrimSpace(r.FormValue("posted_at")); at != "" { // blank keeps the current date
 		var ok bool