Fix backtick back button to work reliably, improve Terminal Shell responsiveness, enhance HID Injector feedback

src/core/shell.cpp

@@ -159,20 +159,20 @@ void Shell::loop() {
   if (M5Cardputer.Keyboard.isChange() && M5Cardputer.Keyboard.isPressed()) {
     auto st = M5Cardputer.Keyboard.keysState();
     for (char c : st.word) {
-      if (c == '`') { if (active >= 0) back(); continue; }
+      if (c == '`' || c == 27) { if (active >= 0) { back(); continue; } }
       if (active < 0) {
         if (c == ';') { sel = (sel - 1 + nmods) % nmods; drawMenu(); }
         else if (c == '.') { sel = (sel + 1) % nmods; drawMenu(); }
         else if (c == '\r' || c == ' ') enter(sel);
       } else {
-        mods[active]->onKey(c);
+        bool consumed = mods[active]->onKey(c);
+        if (!consumed && c == '`') back();
       }
     }
     if (st.enter && active < 0) enter(sel);
   }
 
   if (active < 0) {
-    // keep the selection glow breathing — repaints only the bar strip (flicker-free)
     if (millis() - lastTick > 90) { lastTick = millis(); drawMenu(false); }
     return;
   }

src/modules/hidinjector.cpp

@@ -21,12 +21,13 @@ public:
   void onEnter() override {
     active = false;
     sent = 0;
-    say("HID ready, plug USB host");
+    say("HID ready");
 #ifdef HAVE_TINYSB
     if (tud_mounted()) {
       active = true;
       sent = 0;
-      say("Host detected - injecting");
+      say("Host detected!");
+      say("Injecting...");
     }
 #endif
   }

src/modules/terminalemu.cpp

@@ -43,10 +43,13 @@ public:
 
   void tick() override {
     if (!connected) return;
-    while (ser.available()) {
+    uint32_t start = millis();
+    while (ser.available() && millis() - start < 10) {
       char c = ser.read();
-      if (rxPos < sizeof(rxBuffer) - 1) rxBuffer[rxPos++] = c;
-      if (rxPos >= sizeof(rxBuffer) - 1) rxPos = sizeof(rxBuffer) - 1;
+      if (rxPos < sizeof(rxBuffer) - 1) {
+        rxBuffer[rxPos++] = c;
+        if (c == '\n') rxPos = 0;
+      }
     }
   }