feat(report): improve size summary output

Track the total encoded output size alongside the original and saved
byte counts so the batch summary can show original vs. new totals.

Improve size report feedback for larger outputs by printing the byte
difference as “larger” instead of showing a negative saved value. Rework
the final summary format to include colored encoded, skipped, failed,
total-size, and average saving lines, with skipped and failed counts
broken down by reason.

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