feat(binary): add full binary simulator with unsigned and two’s complement modes

- Introduce new Binary Simulator page with adjustable bit width (4–16 bits)
- Support unsigned and two’s complement representations with live conversion
- Add left/right shift operations and custom binary/denary input
- Implement accessible bulb-and-switch UI with MD3-inspired styling
- Add seven-segment display font assets for realistic number output
- Establish shared base layout, styles, and tooling for future simulators

Signed-off-by: Alexander Lyall <alex@adcm.uk>

src/scripts/unsignedBinary.js

@@ -0,0 +1,54 @@
+let bits = [128,64,32,16,8,4,2,1];
+let state = Array(8).fill(0);
+
+const denaryEl = document.getElementById("denaryNumber");
+const binaryEl = document.getElementById("binaryNumber");
+const bitEls = document.querySelectorAll(".bit");
+
+bitEls.forEach((el, i) => {
+  el.addEventListener("click", () => {
+    state[i] = state[i] ? 0 : 1;
+    el.classList.toggle("on");
+    update();
+  });
+});
+
+function update() {
+  const denary = state.reduce((sum, bit, i) => sum + bit * bits[i], 0);
+  denaryEl.textContent = denary;
+  binaryEl.textContent = state.join("");
+}
+
+function requestBinary() {
+  const input = prompt("Enter 8-bit binary:");
+  if (!/^[01]{8}$/.test(input)) return;
+  state = input.split("").map(Number);
+  bitEls.forEach((el,i)=>el.classList.toggle("on",state[i]));
+  update();
+}
+
+function requestDenary() {
+  const input = parseInt(prompt("Enter denary (0–255)"),10);
+  if (isNaN(input) || input < 0 || input > 255) return;
+
+  let value = input;
+  state = bits.map(b => {
+    if (value >= b) {
+      value -= b;
+      return 1;
+    }
+    return 0;
+  });
+
+  bitEls.forEach((el,i)=>el.classList.toggle("on",state[i]));
+  update();
+}
+
+function shiftBinary(dir) {
+  if (dir === "left") state.shift(), state.push(0);
+  if (dir === "right") state.pop(), state.unshift(0);
+  bitEls.forEach((el,i)=>el.classList.toggle("on",state[i]));
+  update();
+}
+
+update();