fix(i18n): translate AI image drop hint

[mardausdennis]

The Drop image to attach string was previously present in the POT, but the AI panel rewrite lost its translation wrapper. This restores the existing __() pattern for that hint.

[greptile-apps]

Confidence Score: 5/5

The PR appears safe to merge with no actionable issues identified.

The translation helper is globally registered, typed, and already used through the same template pattern throughout the frontend.

_{Reviews (1): Last reviewed commit: "fix(i18n): translate AI image drop hint" | Re-trigger Greptile}

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 66.06%. Comparing base (12c787a) to head (237a775).

Additional details and impacted files

@@           Coverage Diff            @@
##           develop     #790   +/-   ##
========================================
  Coverage    66.06%   66.06%           
========================================
  Files           93       93           
  Lines        10386    10386           
========================================
  Hits          6862     6862           
  Misses        3524     3524           

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