Fix Android photo discovery: dynamically scan all DCIM subdirs

Instead of hardcoding /sdcard/DCIM/Camera, list all subdirectories
under /sdcard/DCIM and /storage/emulated/0/DCIM dynamically. This
handles Samsung, Pixel, OnePlus and other vendors that use different
DCIM subfolder names. Falls back to hardcoded list if discovery finds
nothing.

src/main/kotlin/com/bolenpad/photophetch/device/AndroidConnector.kt

@@ -24,8 +24,9 @@ class AndroidConnector(
 
     private val log = LoggerFactory.getLogger(AndroidConnector::class.java)
 
-    // Directories on Android that contain camera-roll originals
+    // Directories on Android that contain camera-roll originals.
-    private val cameraDirs = listOf(
+    // Used as fallback if dynamic DCIM discovery finds nothing.
+    private val fallbackCameraDirs = listOf(
         "/sdcard/DCIM/Camera",
         "/sdcard/DCIM/100ANDRO",
         "/sdcard/Pictures/Camera",
@@ -65,13 +66,30 @@ class AndroidConnector(
         val serial = requireSerial(device)
         val photos = mutableListOf<PhonePhoto>()
 
-        for (dir in cameraDirs) {
+        // Dynamically discover all subdirectories under DCIM on common storage paths
-            // Check if directory exists first
+        val dcimRoots = listOf("/sdcard/DCIM", "/storage/emulated/0/DCIM")
+        val cameraDirs = mutableListOf<String>()
+
+        for (root in dcimRoots) {
+            val lsOutput = runAdb(serial, "shell", "ls", root, "2>/dev/null")
+            if (lsOutput.contains("No such file") || lsOutput.isBlank()) continue
+            lsOutput.lines()
+                .map { it.trim() }
+                .filter { it.isNotBlank() && !it.contains("No such file") }
+                .forEach { subdir -> cameraDirs.add("$root/$subdir") }
+        }
+
+        // Also check Pictures/Camera (some Samsung models store there)
+        cameraDirs.add("/sdcard/Pictures/Camera")
+        cameraDirs.add("/storage/emulated/0/Pictures/Camera")
+
+        // Fall back to hardcoded list if dynamic discovery found nothing
+        val dirsToScan = cameraDirs.ifEmpty { fallbackCameraDirs }
+
+        for (dir in dirsToScan) {
             val check = runAdb(serial, "shell", "ls", dir, "2>/dev/null")
             if (check.contains("No such file") || check.isBlank()) continue
 
-            // List files with metadata: size, date, time, name
-            // `stat` format: size=%s mtime=%Y path=%n
             val statOutput = runAdb(
                 serial, "shell",
                 "find", dir, "-maxdepth", "1", "-type", "f",
@@ -98,8 +116,6 @@ class AndroidConnector(
                         filename = filename,
                         sizeBytes = sizeBytes,
                         dateTaken = Instant.ofEpochSecond(epochSecs),
-                        // Android stat doesn't give EXIF; we infer Make/Model from
-                        // the device itself rather than per-file EXIF
                         exifMake = device.displayName,
                         exifModel = device.displayName,
                         mediaType = if (ext in setOf("mp4", "mov", "3gp", "avi"))