The thumb sticks and the reach joystick are gone from every layout, with their code and tests #278

From #50 (owner: "i dont know what the joystick is meant to do. maybe we can remove it").

Done:

• [ ] #sticks and #reach, with their CSS and script, are removed from Software/so101/src/viewer.html. src/ui/reach.js and src/ui/reach.test.ts are deleted, along with every reference to them (including src/browser-modules.ts if it lists them).
• [ ] A test: the served page has no joystick or stick elements.
• [ ] forge.json untouched. bun --cwd Software/so101 test passes.