Refactor gzip decompression flag to explicitly track success state

[Copilot]

The is_gzipped variable in _inject_toolbar() was ambiguous—it initially tracked whether the Content-Encoding header indicated gzip, then was repurposed to track decompression success.

Changes

• Renamed is_gzipped to decompressed with explicit success tracking
• Set flag only when gzip.decompress() succeeds, not based on header presence
• Replaced conditional assignment (is_gzipped = False) with explicit initialization pattern

Before:

is_gzipped = content_encoding.lower() == "gzip"
if is_gzipped:
    try:
        body = gzip.decompress(body)
    except (gzip.BadGzipFile, OSError):
        is_gzipped = False  # Repurposed to mean "decompression succeeded"

After:

decompressed = False
if content_encoding.lower() == "gzip":
    try:
        body = gzip.decompress(body)
        decompressed = True  # Explicit success tracking
    except (gzip.BadGzipFile, OSError):
        pass

The flag now unambiguously indicates whether we hold decompressed data, making the subsequent error handling logic clearer.

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[Copilot]

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