Follow-up to #6943 — addresses review feedback.

Changes

• Broadens the numeric regex to accept + signs (+720deg), bare decimals (.5deg), and trailing-dot forms (5.deg) — all valid CSS <number> representations
• Consolidates the four separate unit regexes into a single shared unitPattern + unitToDegrees lookup, removing repetition

The old regex (-?\d+(?:\.\d+)?) would miss +720deg, causing it to fall through to the DOMMatrix path and return 0 — the exact bug the original PR was fixing.

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