fix(esp32-c3): drive digital inputs from the SPICE solve (spiceDrivenInputs)

Esp32C3Simulator already had the GPIO_IN plumbing (setPinState -> gpioIn ->
GPIO_IN_REG read) but never opted into connectDigitalInputsToMcu, so a pin
wired to a switch/button was never fed the solved circuit voltage and
digitalRead() ignored the real wiring. Enabling the flag (as AVRSimulator and
RP2040Simulator already do) completes the issue #247 fix: the ESP32-C3 now
reads GPIO2 from the SPICE solve, so toggling the slide switch flips the LED.
BasicParts' button/slide-switch seed already yields to spiceDriven(), so there
is no double-drive.

frontend/src/simulation/Esp32C3Simulator.ts

@@ -112,6 +112,14 @@ const CYCLES_PER_FRAME = Math.round(CPU_HZ / 60);
 const CYCLES_PER_TICK = 160_000;
 
 export class Esp32C3Simulator {
+  // Opt into connectDigitalInputsToMcu: after every SPICE solve the connector
+  // thresholds each input pin's net voltage and pushes the logic level into the
+  // GPIO_IN register via setPinState(). So digitalRead() reflects the real
+  // wiring (a switch/button tied to 3V3 reads HIGH) instead of a hardcoded part
+  // seed. The connector skips MCU-driven output pins and floating (non-sourced)
+  // nets, so event-driven parts with no SPICE model keep driving their pins via
+  // the part layer. Mirrors AVRSimulator / RP2040Simulator.
+  readonly spiceDrivenInputs = true;
   private core: RiscVCore;
   private flash: Uint8Array;
   private dram: Uint8Array;