fix: auto-start UART monitoring on port open success

_on_open_success(): directly call _on_start() instead of just
enabling the button. User no longer needs to click Start —
monitoring begins automatically when the port is available.

Start/Stop buttons remain for manual control.

src/gui/widgets.py

@@ -928,11 +928,11 @@ class UartMonitorWindow(ctk.CTkToplevel):
         threading.Thread(target=_bg_open, daemon=True).start()
 
     def _on_open_success(self) -> None:
-        """Serial port opened — enable Start button."""
+        """Serial port opened — auto-start monitoring."""
         self._is_opening = False
         self._start_btn.configure(state="normal")
-        self._update_status(ACCENT_PENDING, "Ready")
+        self._log(f"[{self._port}] Port ready, auto-starting monitor...\n")
-        self._log(f"[{self._port}] Port ready. Click Start to begin monitoring.\n")
+        self._on_start()
 
     def _show_unavailable(self, reason: str) -> None:
         """Show UART unavailable state."""

vivado.jou

@@ -3,12 +3,12 @@
 # SW Build 4029153 on Fri Oct 13 20:13:54 MDT 2023
 # IP Build 4028589 on Sat Oct 14 00:45:43 MDT 2023
 # SharedData Build 4025554 on Tue Oct 10 17:18:54 MDT 2023
-# Start of session at: Wed Jun 10 15:02:25 2026
+# Start of session at: Wed Jun 10 15:05:14 2026
-# Process ID: 1790665
+# Process ID: 1792267
 # Current directory: /data/work/prj/Zynq_Flasher
-# Command line: vivado -mode batch -source /tmp/zynq_jtag_check_1789776.tcl
+# Command line: vivado -mode batch -source /tmp/zynq_jtag_check_1791893.tcl
 # Log file: /data/work/prj/Zynq_Flasher/vivado.log
 # Journal file: /data/work/prj/Zynq_Flasher/vivado.jou
-# Running On: mkb, OS: Linux, CPU Frequency: 5073.251 MHz, CPU Physical cores: 32, Host memory: 134146 MB
+# Running On: mkb, OS: Linux, CPU Frequency: 5053.205 MHz, CPU Physical cores: 32, Host memory: 134146 MB
 #-----------------------------------------------------------
-source /tmp/zynq_jtag_check_1789776.tcl
+source /tmp/zynq_jtag_check_1791893.tcl

vivado_1790665.backup.jou

@@ -0,0 +1,14 @@
+#-----------------------------------------------------------
+# Vivado v2023.2 (64-bit)
+# SW Build 4029153 on Fri Oct 13 20:13:54 MDT 2023
+# IP Build 4028589 on Sat Oct 14 00:45:43 MDT 2023
+# SharedData Build 4025554 on Tue Oct 10 17:18:54 MDT 2023
+# Start of session at: Wed Jun 10 15:02:25 2026
+# Process ID: 1790665
+# Current directory: /data/work/prj/Zynq_Flasher
+# Command line: vivado -mode batch -source /tmp/zynq_jtag_check_1789776.tcl
+# Log file: /data/work/prj/Zynq_Flasher/vivado.log
+# Journal file: /data/work/prj/Zynq_Flasher/vivado.jou
+# Running On: mkb, OS: Linux, CPU Frequency: 5073.251 MHz, CPU Physical cores: 32, Host memory: 134146 MB
+#-----------------------------------------------------------
+source /tmp/zynq_jtag_check_1789776.tcl