Polish Services: Saudi Coffee rename + image, fix Black Coffee Arabic, hide order notes behind a button (Task #394)

Three small UX fixes on the Services screen:

1. Renamed service id=2 to "قهوة سعودي" / "Saudi Coffee" and swapped
   the thumbnail to a new clear brown image (small dallah pouring
   into a finjan with cardamom + a date) saved at
   public/service-images/saudi-coffee.png. The legacy
   arabic-coffee.png is left in place so any cached references keep
   loading.
2. Renamed service id=2450 Arabic name to "بلاك كوفي" (English
   "Black Coffee" unchanged).
3. OrderServiceModal now opens with the notes textarea collapsed and
   not mounted, so iPad/Safari no longer auto-pops the keyboard. A
   small outline "إضافة ملاحظات / Add notes" button (with pencil
   icon) expands it and focuses the textarea on demand. While
   expanded, a small "إخفاء / Hide" link collapses it again without
   clearing typed text. If initialNotes is non-empty when the dialog
   opens, it starts expanded. Submission behavior unchanged.

Verified DB state after updates:
  id=2    name_ar=قهوة سعودي   name_en=Saudi Coffee  image_url=service-images/saudi-coffee.png
  id=2450 name_ar=بلاك كوفي    name_en=Black Coffee  image_url=service-images/black-coffee.png

Added i18n keys services.addNotes / services.hideNotes to ar.json
and en.json. Added data-testid="order-notes-toggle" and
data-testid="order-notes-textarea" for future tests.

`pnpm --filter @workspace/tx-os typecheck` passes. The pre-existing
`test` workflow failure is unrelated to this change.

.agents/agent_assets_metadata.toml

@@ -48,6 +48,12 @@ uri = "file://artifacts/tx-os/public/service-images/black-coffee.png"
 type = "image"
 title = "black coffee mug"
 
+[[generated]]
+id = "pFSmazHx0m3gsXrCE0oR2"
+uri = "file://artifacts/tx-os/public/service-images/saudi-coffee.png"
+type = "image"
+title = "saudi coffee dallah"
+
 [[outputs]]
 id = "LYgvZ2mSFO2a8Q7YzWuYh"
 uri = "file://attached_assets/tx-icon/main.svg"