Fix external spool mapping inverted on H2C (#492)

On H2C/H2D dual-nozzle printers, tray_now=254 is sent generically for both
external spools. The direct ID comparison always matched Ext-L (id=254),
never Ext-R (id=255). Now uses active_extruder to disambiguate: extruder
1 (left) → Ext-L, extruder 0 (right) → Ext-R.

CHANGELOG.md

@@ -7,6 +7,7 @@ All notable changes to Bambuddy will be documented in this file.
 ### Fixed
 - **"Unknown stage (74)" on H2D During Print Preparation** — The H2D firmware reports `stg_cur=74` during print preparation, but this stage was not in the stage name lookup table (which went up to 66, sourced from BambuStudio). Now maps stage 74 to "Preparing". Also added stage 77 ("Preparing AMS") which was present in BambuStudio but missing from the lookup.
 - **Wrong Documentation Link for "Lubricate Carbon Rods" on P2S** ([#490](https://github.com/maziggy/bambuddy/issues/490)) — The "Lubricate Carbon Rods" maintenance task linked to the belt tension wiki page instead of the XYZ axis lubrication page for P2S printers.
+- **External Spool Mapping Inverted on H2C** ([#492](https://github.com/maziggy/bambuddy/issues/492)) — On H2C dual-nozzle printers, printing from the right nozzle's external spool (Ext-R) incorrectly highlighted the left external spool (Ext-L) as active. The H2C firmware reports `tray_now=254` generically for both external spools, so the frontend's direct ID comparison (`effectiveTrayNow === extTrayId`) always matched Ext-L (id=254). Now uses `active_extruder` on dual-nozzle printers to determine which external spool is active: extruder 1 (left) → Ext-L, extruder 0 (right) → Ext-R.
 - **Developer Mode Detection Always Reports Null** — The MQTT `fun` field is an integer in the JSON payload, but the parser used `int(value, 16)` which requires a string argument. This raised `TypeError` on every message, silently caught by the exception handler, so `developer_mode` was never set. Now handles both integer and hex string formats.
 - **File Manager Rename Doesn't Update Displayed Name** ([#460](https://github.com/maziggy/bambuddy/issues/460)) — Renaming a file in the File Manager updated the `filename` field but not `file_metadata.print_name`, which the UI uses as the primary display name. Since `print_name` is extracted from inside the 3MF at upload time, it always took precedence over the renamed `filename`. The rename endpoint now also updates `print_name` in the file metadata when present.
 - **Finish Photo Not Captured When Archive Has No Source 3MF** ([#484](https://github.com/maziggy/bambuddy/issues/484)) — When a print completed but the 3MF source file wasn't downloaded from the printer (e.g. FTP download failure), the archive's `file_path` was null. The finish photo capture silently skipped because it derived the save directory from `file_path`. Now falls back to `archive/{id}/` so the photo is captured regardless.

frontend/src/pages/PrintersPage.tsx

@@ -3239,7 +3239,13 @@ function PrinterCard({
                           <div className={`grid ${status.vt_tray.length > 1 ? 'grid-cols-2' : 'grid-cols-1'} gap-1.5`}>
                             {[...status.vt_tray].sort((a, b) => (a.id ?? 254) - (b.id ?? 254)).map((extTray) => {
                               const extTrayId = extTray.id ?? 254;
-                              const isExtActive = effectiveTrayNow === extTrayId;
+                              // On dual-nozzle (H2C/H2D), tray_now=254 means "external spool"
+                              // generically — use active_extruder to determine L vs R:
+                              // extruder 1=left → Ext-L (id=254), extruder 0=right → Ext-R (id=255)
+                              const isExtActive = isDualNozzle && effectiveTrayNow === 254
+                                ? (extTrayId === 254 && status.active_extruder === 1) ||
+                                  (extTrayId === 255 && status.active_extruder === 0)
+                                : effectiveTrayNow === extTrayId;
                               const slotTrayId = extTrayId - 254; // 0 or 1
                               const extLabel = isDualNozzle
                                 ? (extTrayId === 254 ? t('printers.extL') : t('printers.extR'))

static/index.html

@@ -23,7 +23,7 @@
 
     <!-- Splash screens for iOS -->
     <link rel="apple-touch-startup-image" href="/img/android-chrome-512x512.png" />
-    <script type="module" crossorigin src="/assets/index-BqfjFOCr.js"></script>
+    <script type="module" crossorigin src="/assets/index-t1Z8cVOI.js"></script>
     <link rel="stylesheet" crossorigin href="/assets/index-COFMpymr.css">
   </head>
   <body>