- Remove global-toolbar (footer with code display) entirely
- Move Generate, Save, Load, New, Tests buttons to algorithm pane toolbar
- Replace prog.generateCode() with prog.generateAndDownload() — creates
a Blob from the IR and triggers a program.ll download via a temp <a>
- Remove copyCode function from helpers.js (no longer needed)
- Remove global-toolbar and .code-output CSS rules
- Add .action-btn styling for the text buttons in pane-toolbar
- WCBlock.generateCode checks _isFlowBlock (set from #draw-area presence)
before emitting labels/gotos; variable blocks in #variable-area skip this
- Remove unconditional vertices array creation in main() — it was only
relevant for the SDL3 triangle template, which should create it itself
if needed