test(webkit/window): guard the mock window's fields with a mutex

[Snider]

The data race go test -race ./display/webkit/pkg/window/ reports on main is in the test double, not production code. mockWindow.ExecJS appended to execJSCalls unguarded while the test's goroutine read the same slice.

Fix

• one mutex per mock window, covering every field
• reads go through a new execJSCallsSnapshot() accessor
• emit / emitFileDrop copy the handler slice outside the lock, so a handler that re-enters the mock cannot deadlock

Receipt

GOWORK=off go test -race -count=5 ./display/webkit/pkg/window/

	WARNING: DATA RACE
before (main@95593e4)	2
after	0 — ok dappco.re/go/render/display/webkit/pkg/window 2.150s

🤖 Generated with Claude Code
Co-Authored-By: Virgil virgil@lethean.io

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📥 Commits

Reviewing files that changed from the base of the PR and between 95593e4 and 8672024.

📒 Files selected for processing (2)

• go/display/webkit/pkg/window/mock_test.go
• go/display/webkit/pkg/window/service_test.go

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