feat(SorobanInvokeButton): show method name in loading label, tooltip prop, max-height constraint on result block

[k-deejah]

Problem

1. SorobanInvokeButton does not show the method name being invoked in the loading state — state === "loading" shows "Invoking…" with no indication of which method is being called, making it confusing when multiple buttons are on the same page.

2. SorobanInvokeButton does not support a tooltip prop for the invoke button — the title={!isConnected ? "Connect wallet to invoke" : undefined} tooltip only applies when disconnected. When connected, hovering gives no information about what the method does.

3. SorobanInvokeButton result display has no max height — large contract return values push the page layout — the result <pre> block has whitespace-pre-wrap break-all but no max-h constraint. A contract returning megabytes of data would break the layout.

Solution

1. Change loading label to Invoking ${params.method}… when buttonLabel is the default.
2. Add tooltip?: string prop rendered as title={tooltip} on the button when connected.
3. Add maxResultHeight?: number prop (default 200px); wrap the result <pre> in a max-h container with overflow-y-auto.

Acceptance Criteria

• Loading state shows Invoking {method}… for default-labelled buttons
• tooltip prop renders as native tooltip on the button
• Result block is height-constrained with a scrollable overflow
• npm run build passes

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Note for Contributors: Write a clear PR description. Include a screenshot of the constrained result block with a large output.