fix: RoundTrip_SaveRestore_CorrectOrder test assertions are broken

[DanielKow]

Problem

BlazorBlaze.Tests.VectorGraphics.Protocol.EncoderDecoderIntegrationTests.RoundTrip_SaveRestore_CorrectOrder fails on master (pre-existing, not introduced by any PR).

Failure:

Expected canvas.Operations to contain items {"Save", "SetMatrix"} in consecutive order,
but "SetMatrix" (index 1) did not appear (in the right consecutive order).

Root cause

Two wrong assertions:

1. ContainInConsecutiveOrder("Save", "SetMatrix") — requires exact string equality, but the actual operation string is "SetMatrix(1.00,0.00,100.00,...)" with matrix parameters appended.
2. canvas.Operations.Last().Should().Be("Restore") — RestoreContext emits a trailing SetMatrix to restore the saved transformation, so "Restore" is never the last operation.

Fix needed

Replace both assertions with predicate/index-based checks that match the actual operation string format:

• Use IndexOf / FindIndex(op => op.StartsWith(...)) for ordering verification
• Use Contain("Restore") instead of Last().Be("Restore")

Skipped in

PR #7 (epic-020 iter-21 bridge) — test skipped with [Skip] to unblock CI gate.