Remove debug logging from ExercisePage

[flamekaiser007]

Removed client-side debug logging for fetched exercises.

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[flamekaiser007]

fix: remove debug console.log statements from ExercisePage

Removed leftover client-side debug logging from fetchExercises and
handleImageError that were introduced during development:

• Removed console.log block logging exercise count, name, gifUrl,
  and imageUrl presence after successful API response
• Removed console.warn on image load failure in handleImageError

console.error in the catch block is retained as it serves as a
legitimate error signal for failed fetch requests.