fix: legacy QR URLs without '?' (productid in path) redirect to /t/CODE (new tag 97 now scans); preview page photo portrait aspect; Preview button on user tags list; admin photo form = preview + standalone Upload button (removed URL TextInput — no duplicate, no stale placeholder)

frontend/internal/handlers/legacy.go

@@ -0,0 +1,21 @@
+package handlers
+
+import (
+	"net/http"
+	"strings"
+)
+
+// LegacyNotFound handles old printed QR URLs of the form
+// https://where-woof.com/x=5&productid=CODE (no '?' before productid —
+// the whole thing lands in the path). Redirects to /t/CODE.
+func (a *App) LegacyNotFound(w http.ResponseWriter, r *http.Request) {
+	path := r.URL.Path
+	if i := strings.Index(path, "productid="); i >= 0 {
+		code := path[i+len("productid="):]
+		if code != "" {
+			http.Redirect(w, r, "/t/"+code, http.StatusFound)
+			return
+		}
+	}
+	http.NotFound(w, r)
+}

frontend/main.go

@@ -70,7 +70,7 @@ func main() {
 	mux.HandleFunc("GET /about", app.About)
 	mux.HandleFunc("GET /what-is-this", app.WhatIsThis)
 	mux.HandleFunc("GET /contact", app.Contact)
-	mux.HandleFunc("/{path...}", http.NotFound)
+	mux.HandleFunc("/{path...}", app.LegacyNotFound)
 	mux.HandleFunc("GET /t/{tag_code}", app.PublicTag)
 	mux.HandleFunc("GET /s/{code}", app.ServeShort)
 	mux.HandleFunc("POST /t/{tag_code}/scan", app.Scan)

frontend/templates/tag-list.html

@@ -25,6 +25,7 @@
           {{if ne .Status "closed"}}
           <a href="/account/tags/{{.ID}}/edit" class="text-amber-600 hover:underline">Edit</a>
           {{end}}
+          <a href="/t/{{.TagCode}}?preview=1" target="_blank" rel="noopener" class="ml-3 text-blue-600 hover:underline">Preview</a>
           <form hx-post="/account/tags/{{.ID}}/close" hx-target="#account-panel" hx-swap="outerHTML" hx-confirm="Close this tag? It will stop alerts but keep its details." class="inline">
             <button class="ml-3 text-stone-500 hover:underline">Close</button>
           </form>

frontend/templates/tag-public.html

@@ -40,7 +40,7 @@
       </div>
       <div class="p-6">
         {{if .Data.PhotoUrl.Valid}}
-        <img src="{{.Data.PhotoUrl.String}}?v={{.Data.UpdatedAt.Time.Unix}}" alt="Item photo" class="mb-4 h-56 w-full rounded-lg object-cover">
+        <img src="{{.Data.PhotoUrl.String}}?v={{.Data.UpdatedAt.Time.Unix}}" alt="Item photo" class="mb-4 w-full rounded-lg object-cover" style="aspect-ratio: 3 / 4;">
         {{end}}
         {{if .Data.Description.Valid}}
         <p class="text-stone-700">{{.Data.Description.String}}</p>