fix(ui): tighten deployer layout and transaction actions

[gRoussac]

Summary

• Compact chain name (input + preset select on one row) and a 2-row transaction action grid with clearer icons
• Pin Notes under Output, remove unused Angular router, and keep the page from scrolling when the viewport fits
• Stop the args-builder host from creating an extra grid row; rename Transaction Info field label to Hash

Test plan

• Open http://localhost:4242/ at ~932px height: no page scrollbar when content fits
• Notes stay near the bottom of the result column, aligned with transaction actions
• Chain name: type a custom name or pick a preset; value persists across reload
• Transaction buttons: two rows, equal height, icons on all five actions
• Args builder modal still opens from ⇇ build

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