feat(ui): add Template constructor attributes

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Summary

• Let ui.NewTemplate accept trusted raw wrapper attributes directly.
• Keep Template value-comparable by joining constructor attributes into one definition field.
• Preserve attribute precedence: render parameters, constructor attributes, then Dot attributes.
• Reuse children for equal definitions and replace them when constructor attributes change.

Verification

• go generate ./...
• go vet ./...
• gofmt -l .
• staticcheck ./...
• golangci-lint run
• gosec ./...
• go build ./...
• JAWS_REQUIRE_NODE=1 go test -race ./...
• JAWS_REQUIRE_NODE=1 go test ./...

The optional 386 runtime leg was not run on this aarch64 host.