shader_recompiler: Add stubs for CSM/FCSM flow test conditions

Add stub implementations for previously unhandled flow test conditions in the
shader recompiler's IR emitter. These conditions were previously throwing
"Not Implemented" exceptions when encountered.

The following flow test cases are now stubbed:
- FCSM_TR (Fragment Shader Coarse/Fine Mode Test and Reject)
- CSM_TA (Coarse/Fine Mode Test Accept)
- CSM_TR (Coarse/Fine Mode Test and Reject)
- CSM_MX (Coarse/Fine Mode Maximum)
- FCSM_TA (Fragment Shader Coarse/Fine Mode Test Accept)
- FCSM_MX (Fragment Shader Coarse/Fine Mode Maximum)

Currently these stubs:
1. Return false (ir.Imm1(false)) as a placeholder value
2. Log a warning message indicating the stub
3. Allow shaders using these conditions to compile rather than fail

This is a step toward proper implementation of coarse/fine mode shader
operations. The stubs prevent crashes while making it clear which code paths
need full implementation.

Technical notes:
- Removed the previous FCSM_TR implementation that used flag operations
- Added consistent warning messages for tracking stub usage
- Kept within the existing GetFlowTest switch statement structure

src/android/app/src/main/java/org/citron/citron_emu/fragments/EmulationFragment.kt

@@ -10,6 +10,7 @@ import android.content.DialogInterface
 import android.content.pm.ActivityInfo
 import android.content.res.Configuration
 import android.net.Uri
+import android.os.BatteryManager
 import android.os.Bundle
 import android.os.Handler
 import android.os.Looper
@@ -531,59 +532,8 @@ class EmulationFragment : Fragment(), SurfaceHolder.Callback {
                 if (emulationViewModel.emulationStarted.value &&
                     !emulationViewModel.isEmulationStopping.value
                 ) {
-                    val thermalStatus = when (powerManager.currentThermalStatus) {
-                        PowerManager.THERMAL_STATUS_LIGHT -> 0.25f
-                        PowerManager.THERMAL_STATUS_MODERATE -> 0.5f
-                        PowerManager.THERMAL_STATUS_SEVERE -> 0.75f
-                        PowerManager.THERMAL_STATUS_CRITICAL,
-                        PowerManager.THERMAL_STATUS_EMERGENCY,
-                        PowerManager.THERMAL_STATUS_SHUTDOWN -> 1.0f
-                        else -> 0f
-                    }
-
-                    // Get temperature from battery thermal sensor
-                    val temperature = try {
-                        val process = Runtime.getRuntime().exec("cat /sys/class/power_supply/battery/temp")
-                        val reader = process.inputStream.bufferedReader()
-                        val temp = reader.readLine().toFloat() / 10f // Convert from decidegrees to degrees
-                        reader.close()
-                        temp
-                    } catch (e: Exception) {
-                        0f
-                    }
-
-                    // Convert to Fahrenheit
-                    val fahrenheit = (temperature * 9f / 5f) + 32f
-
-                    if (_binding != null) {
-                        // Color interpolation based on temperature (green at 30°C, red at 45°C)
-                        val normalizedTemp = ((temperature - 30f) / 15f).coerceIn(0f, 1f)
-                        val red = (normalizedTemp * 255).toInt()
-                        val green = ((1f - normalizedTemp) * 255).toInt()
-                        val color = android.graphics.Color.rgb(red, green, 0)
-
-                        // Create a modern progress bar using block elements
-                        val progressBarLength = 12
-                        val filledBars = (thermalStatus * progressBarLength).toInt()
-                        val progressBar = buildString {
-                            append("│") // Left border
-                            repeat(filledBars) { append("█") }
-                            repeat(progressBarLength - filledBars) { append("░") }
-                            append("│") // Right border
-
-                            // Add percentage
-                            append(" ")
-                            append(String.format("%3d%%", (thermalStatus * 100).toInt()))
-                        }
-
-                        binding.showThermalsText.setTextColor(color)
-                        binding.showThermalsText.text = String.format(
-                            "%s\n%.1f°C • %.1f°F",
-                            progressBar,
-                            temperature,
-                            fahrenheit
-                        )
-                    }
+                    val temperature = getBatteryTemperature(requireContext())
+                    updateThermalOverlay(temperature)
                     thermalStatsUpdateHandler.postDelayed(thermalStatsUpdater!!, 1000)
                 }
             }
@@ -595,6 +545,53 @@ class EmulationFragment : Fragment(), SurfaceHolder.Callback {
         }
     }
 
+    private fun updateThermalOverlay(temperature: Float) {
+        if (BooleanSetting.SHOW_THERMAL_OVERLAY.getBoolean() &&
+            emulationViewModel.emulationStarted.value &&
+            !emulationViewModel.isEmulationStopping.value
+        ) {
+            // Get thermal status
+            val thermalStatus = when (powerManager.currentThermalStatus) {
+                PowerManager.THERMAL_STATUS_LIGHT -> 0.25f
+                PowerManager.THERMAL_STATUS_MODERATE -> 0.5f
+                PowerManager.THERMAL_STATUS_SEVERE -> 0.75f
+                PowerManager.THERMAL_STATUS_CRITICAL,
+                PowerManager.THERMAL_STATUS_EMERGENCY,
+                PowerManager.THERMAL_STATUS_SHUTDOWN -> 1.0f
+                else -> 0f
+            }
+
+            // Convert to Fahrenheit for additional info
+            val fahrenheit = (temperature * 9f / 5f) + 32f
+
+            // Create progress bar using block elements
+            val progressBarLength = 12
+            val filledBars = (thermalStatus * progressBarLength).toInt()
+            val progressBar = buildString {
+                append("│") // Left border
+                repeat(filledBars) { append("█") }
+                repeat(progressBarLength - filledBars) { append("░") }
+                append("│") // Right border
+                append(" ")
+                append(String.format("%3d%%", (thermalStatus * 100).toInt()))
+            }
+
+            // Color interpolation based on temperature (green at 30°C, red at 45°C)
+            val normalizedTemp = ((temperature - 30f) / 15f).coerceIn(0f, 1f)
+            val red = (normalizedTemp * 255).toInt()
+            val green = ((1f - normalizedTemp) * 255).toInt()
+            val color = android.graphics.Color.rgb(red, green, 0)
+
+            binding.showThermalsText.setTextColor(color)
+            binding.showThermalsText.text = String.format(
+                "%s\n%.1f°C • %.1f°F",
+                progressBar,
+                temperature,
+                fahrenheit
+            )
+        }
+    }
+
     @SuppressLint("SourceLockedOrientationActivity")
     private fun updateOrientation() {
         emulationActivity?.let {
@@ -1095,4 +1092,12 @@ class EmulationFragment : Fragment(), SurfaceHolder.Callback {
         private val perfStatsUpdateHandler = Handler(Looper.myLooper()!!)
         private val thermalStatsUpdateHandler = Handler(Looper.myLooper()!!)
     }
+
+    private fun getBatteryTemperature(context: Context): Float {
+        val batteryManager = context.getSystemService(Context.BATTERY_SERVICE) as BatteryManager
+        // Get temperature in tenths of a degree Celsius
+        val temperature = batteryManager.getIntProperty(BatteryManager.BATTERY_PROPERTY_TEMPERATURE)
+        // Convert to degrees Celsius
+        return temperature / 10.0f
+    }
 }