fix(print-log): render one swatch per color for multi-color filament rows (#1731 part 1)

The per-archive Print Log table cell at ArchivesPage.tsx:3882 rendered
  filament_color as a single swatch with
  `backgroundColor: entry.filament_color.startsWith('#') ? ... : undefined`.

  For multi-color prints, the backend writes filament_color as a comma-joined
  string ("#FFFFFF,#000000,#FF0000"). The whole string trivially passed the
  startsWith('#') check but isn't a valid CSS color — the browser silently
  drops the declaration and the swatch falls back to its black/20% border,
  which on the dark theme reads as a barely-visible grey dot. Reporter's
  screenshots showed "PLA" text with no visible swatch at all. DB column
  was correct; render dropped the colors.

  The Archive Card view at ArchivesPage.tsx:1072-1083 and :2114-2125 already
  splits on comma and renders one swatch per color — only the Print Log
  table cell had been missed when multi-color support landed elsewhere.

  Fix mirrors the card pattern: wrap swatches in a flex container, split
  on comma, trim, render one w-3 h-3 swatch per color with
  backgroundColor and title={trimmed}. Single-color prints render one
  swatch (no behaviour change). Empty / non-hex entries fall through to
  no backgroundColor rather than poisoning the CSS for siblings.

  Does NOT cover the reporter's second symptom — new multi-color prints
  missing from filament usage history. That's usage_tracker._track_from_3mf
  and the slot-to-tray mapping chain; needs a support bundle (PRINT START
  + PRINT COMPLETE [UsageTracker] log lines + captured ams_mapping) before
  shape can be confirmed. Tracking as #1731 part 2.

frontend/src/pages/ArchivesPage.tsx

@@ -3881,10 +3881,19 @@ export function ArchivesPage() {
                           <td className="px-4 py-3">
                             <div className="flex items-center gap-1.5">
                               {entry.filament_color && (
-                                <span
-                                  className="w-3 h-3 rounded-full border border-black/20 flex-shrink-0"
-                                  style={{ backgroundColor: entry.filament_color.startsWith('#') ? entry.filament_color : undefined }}
-                                />
+                                <div className="flex items-center gap-0.5 flex-wrap">
+                                  {entry.filament_color.split(',').map((color, i) => {
+                                    const trimmed = color.trim();
+                                    return (
+                                      <span
+                                        key={i}
+                                        className="w-3 h-3 rounded-full border border-black/20 flex-shrink-0"
+                                        style={{ backgroundColor: trimmed.startsWith('#') ? trimmed : undefined }}
+                                        title={trimmed}
+                                      />
+                                    );
+                                  })}
+                                </div>
                               )}
                               <span className="text-bambu-gray-light text-xs">
                                 {entry.filament_type || '—'}

static/index.html

@@ -26,7 +26,7 @@
 
     <!-- Splash screens for iOS -->
     <link rel="apple-touch-startup-image" href="/img/android-chrome-512x512.png" />
-    <script type="module" crossorigin src="/assets/index-BwzCCxhK.js"></script>
+    <script type="module" crossorigin src="/assets/index-DrU3fLKW.js"></script>
     <link rel="stylesheet" crossorigin href="/assets/index-45eedLWT.css">
   </head>
   <body>