Fix dashboard failing to load episodes after RSS import

The root cause was that modernc.org/sqlite stores time.Time as strings
but cannot scan strings back into time.Time, causing ListEpisodes to
fail. Changed PublishedAt and CreatedAt in store structs from time.Time
to string, with format/parse handled at the application level.

Also fixed a secondary issue where the published_at format stored during
import had a duplicated timezone offset.

handler/episode.go

@@ -15,6 +15,9 @@ import (
 )
 
 const maxUploadSize = 200 << 20 // 200 MB
+const timeLayout = "2006-01-02 15:04:05"
+
+func fmtTime(t time.Time) string { return t.Format(timeLayout) }
 
 type EpisodeHandler struct {
 	Store     *store.Store
@@ -47,16 +50,20 @@ func (h *EpisodeHandler) ServeDashboard(w http.ResponseWriter, r *http.Request)
 		Description string
 		AudioPath   string
 		ImageURL    template.URL
-		PublishedAt time.Time
+		PublishedAt string
 	}
 	var epViews []epView
 	for _, ep := range episodes {
+		pubFormatted := ep.PublishedAt
+		if pt, err := time.Parse(timeLayout, ep.PublishedAt); err == nil {
+			pubFormatted = pt.Format("Jan 2, 2006")
+		}
 		ev := epView{
 			ID:          ep.ID,
 			Title:       ep.Title,
 			Description: ep.Description,
 			AudioPath:   ep.AudioPath,
-			PublishedAt: ep.PublishedAt,
+			PublishedAt: pubFormatted,
 		}
 		if ep.ImagePath != "" {
 			ev.ImageURL = template.URL("/uploads/" + ep.ImagePath)
@@ -126,7 +133,7 @@ func (h *EpisodeHandler) ServeNew(w http.ResponseWriter, r *http.Request) {
 
 		imagePath, _ := h.saveUploadedFile(r, "image_file", "images")
 
-		_, err = h.Store.CreateEpisode(userID, title, description, audioPath, imagePath, publishedAt)
+		_, err = h.Store.CreateEpisode(userID, title, description, audioPath, imagePath, fmtTime(publishedAt))
 		if err != nil {
 			h.Tpl.Render(w, "episode_form", map[string]any{
 				"Editing": false,
@@ -152,10 +159,14 @@ func (h *EpisodeHandler) ServeEdit(w http.ResponseWriter, r *http.Request) {
 			http.Error(w, "episode not found", http.StatusNotFound)
 			return
 		}
+		pubStr := ""
+		if pt, err := time.Parse(timeLayout, ep.PublishedAt); err == nil {
+			pubStr = pt.Format("2006-01-02T15:04")
+		}
 		h.Tpl.Render(w, "episode_form", map[string]any{
 			"Editing":     true,
 			"Episode":     ep,
-			"PublishedAt": ep.PublishedAt.Format("2006-01-02T15:04"),
+			"PublishedAt": pubStr,
 		})
 		return
 	}
@@ -206,7 +217,7 @@ func (h *EpisodeHandler) ServeEdit(w http.ResponseWriter, r *http.Request) {
 			imagePath = newPath
 		}
 
-		if err := h.Store.UpdateEpisode(id, title, description, audioPath, imagePath, publishedAt); err != nil {
+		if err := h.Store.UpdateEpisode(id, title, description, audioPath, imagePath, fmtTime(publishedAt)); err != nil {
 			http.Error(w, "update failed", http.StatusInternalServerError)
 			return
 		}