refactor(core): combine ffprobe calls and simplify pixel format selection

Merge the two separate ffprobe invocations for codec and pixel format
into one, halving the per-file probe overhead on large batches. Both
error messages now include the filename for easier diagnosis in batch
runs.

Replace the three-way nested if/elif/else for pixel format selection
with two independent case statements — one for chroma subsampling, one
for bit depth — that compose the output format string from two parts.
This eliminates the repetition across the three subsampling branches
and makes adding a new bit depth or subsampling variant a single-line
change. Also add a verbose fallback warning for exotic formats that
don't match any known subsampling pattern.

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