Clarify settings screen with per-feature explanations

Checkbox labels like "Accessibility services" read as status, not action —
unclear whether checking it meant "hide this" or something else. Replaces
the flat label map with a label + one-line description per feature, and
adds a short caption on each app card spelling out what checking a box
actually does.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

app/src/main/java/space/bdeshi/veil/Features.kt

@@ -1,5 +1,7 @@
 package space.bdeshi.veil
 
+data class FeatureInfo(val label: String, val description: String)
+
 object Features {
     const val PREFS_NAME = "veil_prefs"
     const val KEY_PREFIX = "features_"
@@ -21,13 +23,31 @@ object Features {
         BUILD_TAGS,
     )
 
-    val LABELS: LinkedHashMap<String, String> = linkedMapOf(
-        ACCESSIBILITY to "Accessibility services",
-        ADB to "USB / wireless debugging",
-        DEV_OPTIONS to "Developer options enabled",
-        MOCK_LOCATION to "Mock location (legacy flag only)",
-        ROOT_APPS to "Root/manager apps (PackageManager)",
-        BUILD_TAGS to "Build tags/type (test-keys, userdebug)",
+    val INFO: LinkedHashMap<String, FeatureInfo> = linkedMapOf(
+        ACCESSIBILITY to FeatureInfo(
+            "Hide accessibility services",
+            "This app will see zero accessibility services running, even if you have some enabled.",
+        ),
+        ADB to FeatureInfo(
+            "Hide USB / wireless debugging",
+            "This app will see debugging as off, regardless of your actual setting.",
+        ),
+        DEV_OPTIONS to FeatureInfo(
+            "Hide developer options",
+            "This app will see Developer Options as disabled.",
+        ),
+        MOCK_LOCATION to FeatureInfo(
+            "Hide mock location (legacy flag)",
+            "Only covers the old pre-Android-6 system flag — modern per-app mock location isn't covered.",
+        ),
+        ROOT_APPS to FeatureInfo(
+            "Hide root / manager apps",
+            "Apps in the \"hidden packages\" list below become invisible to this app's PackageManager lookups.",
+        ),
+        BUILD_TAGS to FeatureInfo(
+            "Hide test-keys / userdebug build",
+            "This app will see build tags as release-keys/user instead of your real build.",
+        ),
     )
 
     val DEFAULT_HIDDEN_PACKAGES: Set<String> = setOf(

app/src/main/java/space/bdeshi/veil/SettingsActivity.kt

@@ -74,9 +74,9 @@ class SettingsActivity : Activity() {
             setPadding(0, dp(24), 0, dp(4))
         })
         root.addView(TextView(this).apply {
-            text = "Used by the \"Root/manager apps\" toggle above — apps in this list become " +
-                "invisible to getPackageInfo/getInstalledPackages for any target app with that " +
-                "toggle on."
+            text = "Used by the \"Hide root / manager apps\" checkbox above — apps in this list " +
+                "become invisible to PackageManager lookups for any target app with that box " +
+                "checked."
             setPadding(0, 0, 0, dp(8))
         })
 
@@ -154,10 +154,15 @@ class SettingsActivity : Activity() {
             textSize = 16f
             setTypeface(typeface, Typeface.BOLD)
         })
+        card.addView(TextView(this).apply {
+            text = "Checking a box below hides that thing from this app specifically — it stays " +
+                "on for every other app."
+            setPadding(0, 0, 0, dp(8))
+        })
 
-        for ((id, label) in Features.LABELS) {
+        for ((id, info) in Features.INFO) {
             card.addView(CheckBox(this).apply {
-                text = label
+                text = info.label
                 isChecked = id in enabled
                 setOnCheckedChangeListener { _, isChecked ->
                     val current = (prefs.getStringSet(Features.keyFor(pkg), Features.ALL) ?: Features.ALL).toMutableSet()
@@ -166,6 +171,11 @@ class SettingsActivity : Activity() {
                     fixPermissions()
                 }
             })
+            card.addView(TextView(this).apply {
+                text = info.description
+                textSize = 13f
+                setPadding(dp(32), 0, 0, dp(8))
+            })
         }
 
         card.addView(Button(this).apply {