chore: drop noisy embedded-settings warning toast

  SliceJobTrackerContext was emitting a yellow warning toast on every
  completed slice whose result carried `used_embedded_settings: true`
  (the auto-fallback path that fires when the sidecar's --load-settings
  triplet rejected the input).

  For 3MF inputs that fallback fires on essentially every slice in
  production. End-to-end debugging via the new sidecar stderr capture
  showed the BambuStudio CLI segfaults silently after one trace line
  ("Initializing StaticPrintConfigs") when given --load-settings over
  a 3MF — even with the broader strip applied. So the toast fired on
  ~every completed 3MF slice and added noise without an actionable
  path for the user.

  Drop the toast call, drop the now-orphan slice.fallbackUsedEmbedded
  i18n key from all 8 locale files. The `used_embedded_settings` flag
  still lands on SliceResponse / SliceArchiveResponse for tests and
  observability (test_library_slice_api.py:347 continues to pin it);
  only the user-facing toast goes.

CHANGELOG.md

@@ -30,6 +30,8 @@ All notable changes to Bambuddy will be documented in this file.
 - **Inventory: "Delete Tag" button renamed to "Clear RFID Tag"** ([#729](https://github.com/maziggy/bambuddy/issues/729) follow-up) — The reporter mistook the button for a taxonomy-tag delete (it actually clears the RFID tag UID/UUID off the spool record so the row can be re-attached to a different physical spool). Renaming it to "Clear RFID Tag" + the success toast to "RFID tag cleared" removes the ambiguity. No behaviour change. Localised across all 8 UI languages with full translations.
 
 - **Nozzle icon on the dual-nozzle status card** ([#1115](https://github.com/maziggy/bambuddy/issues/1115)) — the dual-nozzle active-extruder card on the printer status bar was the only card in that row without a theme icon (the Nozzle/Bed/Chamber temperature cards all carry a thermometer icon), which left the row looking visually uneven on H2D / H2S / H2C. Adds a small schematic nozzle icon (filament body + heater block + tip) above the L/R diameter labels, styled in amber-400 to match the card's active-extruder accent. SVG design contributed by @m4rtini2.
+- **Slice tracker no longer shows the "embedded settings used" warning toast** — `SliceJobTrackerContext` was emitting a yellow warning toast on every completed slice whose result carried `used_embedded_settings: true` (the auto-fallback path that fires when the sidecar's `--load-settings` triplet rejected the input). For 3MF inputs that fallback fires on essentially every slice in production (BambuStudio CLI segfaults silently on `--load-settings` over 3MF, even with the broader strip applied — verified end-to-end with the new sidecar stderr capture), so the toast was firing on essentially every completed slice and adding noise without a useful action. The `used_embedded_settings` flag still lands on `SliceResponse` / `SliceArchiveResponse` for tests + observability (`test_library_slice_api.py:347` continues to pin it); only the user-facing toast goes. `slice.fallbackUsedEmbedded` removed from all 8 locale files in the same change.
+
 - **Settings page: permission-gated instead of admin-only** — the Settings sidebar entry has always been visible to any user holding `settings:read`, but the route guard required admin role, so a non-admin with `settings:read` would see the entry, click it, and get silently redirected back to the dashboard. The route guard now matches the sidebar: any user with `settings:read` can open the page, and the individual tabs / cards continue to enforce their own per-feature permissions (`users:read`, `groups:update`, `oidc:*`, etc. — many of them admin-only, some not). Group editor routes moved to permission-based guards too (`groups:create` for `/groups/new`, `groups:update` for `/groups/:id/edit`), so permission delegation works end-to-end. Admins retain full access since admins implicitly hold every permission.
 
 ### Added

frontend/src/contexts/SliceJobTrackerContext.tsx

@@ -52,9 +52,11 @@ export function SliceJobTrackerProvider({ children }: { children: ReactNode }) {
       setActiveJobs((prev) => prev.filter((j) => j.id !== job.id));
 
       if (state.status === 'completed') {
-        if (state.result?.used_embedded_settings) {
-          showToast(t('slice.fallbackUsedEmbedded'), 'warning');
-        }
+        // `used_embedded_settings` still comes back on the result for tests
+        // and observability, but the warning toast that surfaced it was
+        // firing on essentially every slice (3MF inputs trigger the
+        // embedded-settings fallback as a normal path) and just added
+        // noise — see the trailing yellow toast complaint, removed.
         showToast(
           t('slice.completedToast', 'Sliced {{name}}', { name: job.sourceName }),
           'success',

frontend/src/i18n/locales/de.ts

@@ -3253,7 +3253,6 @@ export default {
     selectPreset: '— Profil auswählen —',
     loadingPresets: 'Profile werden geladen…',
     presetsLoadFailed: 'Profile konnten nicht geladen werden. Importiere sie zuerst unter Einstellungen → Profile.',
-    fallbackUsedEmbedded: 'Slicer hat die gewählten Profile abgelehnt — stattdessen wurden die im Modell eingebetteten Einstellungen verwendet.',
     enqueuing: 'Slice-Auftrag wird übermittelt…',
     queued: 'In Warteschlange…',
     failed: 'Slicen fehlgeschlagen. Logs des Slicer-Sidecars prüfen.',

frontend/src/i18n/locales/en.ts

@@ -3256,7 +3256,6 @@ export default {
     selectPreset: '— Select a preset —',
     loadingPresets: 'Loading presets…',
     presetsLoadFailed: 'Failed to load presets. Open Settings → Profiles to import them first.',
-    fallbackUsedEmbedded: "Slicer rejected the chosen profiles for this model — used the file's embedded settings instead.",
     enqueuing: 'Submitting slice job…',
     queued: 'Queued…',
     failed: 'Slicing failed. Check the slicer sidecar logs.',

frontend/src/i18n/locales/fr.ts

@@ -3175,7 +3175,6 @@ export default {
     selectPreset: '— Select a preset —',
     loadingPresets: 'Loading presets…',
     presetsLoadFailed: 'Failed to load presets. Open Settings → Profiles to import them first.',
-    fallbackUsedEmbedded: "Slicer rejected the chosen profiles for this model — used the file's embedded settings instead.",
     enqueuing: 'Submitting slice job…',
     queued: 'Queued…',
     failed: 'Slicing failed. Check the slicer sidecar logs.',

frontend/src/i18n/locales/it.ts

@@ -3174,7 +3174,6 @@ export default {
     selectPreset: '— Select a preset —',
     loadingPresets: 'Loading presets…',
     presetsLoadFailed: 'Failed to load presets. Open Settings → Profiles to import them first.',
-    fallbackUsedEmbedded: "Slicer rejected the chosen profiles for this model — used the file's embedded settings instead.",
     enqueuing: 'Submitting slice job…',
     queued: 'Queued…',
     failed: 'Slicing failed. Check the slicer sidecar logs.',

frontend/src/i18n/locales/ja.ts

@@ -3213,7 +3213,6 @@ export default {
     selectPreset: '— Select a preset —',
     loadingPresets: 'Loading presets…',
     presetsLoadFailed: 'Failed to load presets. Open Settings → Profiles to import them first.',
-    fallbackUsedEmbedded: "Slicer rejected the chosen profiles for this model — used the file's embedded settings instead.",
     enqueuing: 'Submitting slice job…',
     queued: 'Queued…',
     failed: 'Slicing failed. Check the slicer sidecar logs.',

frontend/src/i18n/locales/pt-BR.ts

@@ -3188,7 +3188,6 @@ export default {
     selectPreset: '— Select a preset —',
     loadingPresets: 'Loading presets…',
     presetsLoadFailed: 'Failed to load presets. Open Settings → Profiles to import them first.',
-    fallbackUsedEmbedded: "Slicer rejected the chosen profiles for this model — used the file's embedded settings instead.",
     enqueuing: 'Submitting slice job…',
     queued: 'Queued…',
     failed: 'Slicing failed. Check the slicer sidecar logs.',

frontend/src/i18n/locales/zh-CN.ts

@@ -3240,7 +3240,6 @@ export default {
     selectPreset: '— Select a preset —',
     loadingPresets: 'Loading presets…',
     presetsLoadFailed: 'Failed to load presets. Open Settings → Profiles to import them first.',
-    fallbackUsedEmbedded: "Slicer rejected the chosen profiles for this model — used the file's embedded settings instead.",
     enqueuing: 'Submitting slice job…',
     queued: 'Queued…',
     failed: 'Slicing failed. Check the slicer sidecar logs.',

frontend/src/i18n/locales/zh-TW.ts

@@ -3240,7 +3240,6 @@ export default {
     selectPreset: '— Select a preset —',
     loadingPresets: 'Loading presets…',
     presetsLoadFailed: 'Failed to load presets. Open Settings → Profiles to import them first.',
-    fallbackUsedEmbedded: "Slicer rejected the chosen profiles for this model — used the file's embedded settings instead.",
     enqueuing: 'Submitting slice job…',
     queued: 'Queued…',
     failed: 'Slicing failed. Check the slicer sidecar logs.',