Saudi Coffee image cleanup + shrink "Add notes" toggle (Task #395)

Two small follow-ups on Task #394 polish:

1. Regenerated artifacts/tx-os/public/service-images/saudi-coffee.png
   with a tighter prompt — just the brass dallah pouring brown
   coffee into a small white finjan, soft beige background, no
   dates/cardamom/garnish. Same path so no DB change needed.
2. Shrunk the "إضافة ملاحظات / Add notes" toggle in
   OrderServiceModal: replaced the chunky outline Button with a
   small ghost text-link style (text-xs, muted, pencil icon size 12,
   underline-on-hover). It now reads as a secondary affordance and
   sits below the service-preview row, well clear of the dialog's
   absolute close (X) at right-4 top-4 — no overlap in either AR or
   EN.

Behavior unchanged: data-testid="order-notes-toggle" preserved,
tapping still expands and focuses the textarea, hide link still
collapses without losing typed text.

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

.agents/agent_assets_metadata.toml

@@ -52,7 +52,7 @@ title = "black coffee mug"
 id = "pFSmazHx0m3gsXrCE0oR2"
 uri = "file://artifacts/tx-os/public/service-images/saudi-coffee.png"
 type = "image"
-title = "saudi coffee dallah"
+title = "saudi coffee just dallah"
 
 [[outputs]]
 id = "LYgvZ2mSFO2a8Q7YzWuYh"