Drop a pending Regular's link when it is renamed

A Regular added from a recipe link stores recipe_url, and its grounding job
grounds that link. Renaming the dinner while still pending kept the link, so
the job queued for the new name still attached the old link's recipe and
photo. UpdateDinner now sets recipe_url, and renaming a pending dinner
clears it: the fresh job grounds the new name by search, and the household
can give a link by hand to fix up the recipe if they want a specific one.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

internal/db/dinners.sql.go

@@ -543,6 +543,7 @@ SET name = ?,
 	difficulty = ?,
 	cuisine = ?,
 	recipe_id = ?,
+	recipe_url = ?,
 	photo_id = ?,
 	grounding_status = ?,
 	updated_by = ?,
@@ -561,6 +562,7 @@ type UpdateDinnerParams struct {
 	Difficulty      sql.NullString
 	Cuisine         sql.NullString
 	RecipeID        sql.NullString
+	RecipeUrl       sql.NullString
 	PhotoID         sql.NullString
 	GroundingStatus string
 	UpdatedBy       sql.NullString
@@ -580,6 +582,7 @@ func (q *Queries) UpdateDinner(ctx context.Context, arg UpdateDinnerParams) (Din
 		arg.Difficulty,
 		arg.Cuisine,
 		arg.RecipeID,
+		arg.RecipeUrl,
 		arg.PhotoID,
 		arg.GroundingStatus,
 		arg.UpdatedBy,