feat(pairing): CreateInviteScreen invite-code UX, MainActivity nav wiring, LocalQuestionContent question pool expansion, Future.md planning

Future.md

@@ -64,13 +64,12 @@ Improvement & feature ideas surfaced while QA-testing as a consumer (each works
   Check token** (raw Firestore REST) returned `200` for a member — so rules are the *sole* gate. Rules correctly deny
   non-members/cross-couple (all `403`), so this is not a live hole, but enabling App Check enforcement on Firestore
   would block non-app clients entirely (defense-in-depth). *Prompted by:* R7 D3 raw-API angle.
-- **Biometric app-lock re-locks on cold-start/process-death but maybe not plain background→resume.** R15 code review:
+- **✅ DONE (R21) — Biometric app-lock now re-arms on background/timeout (was: only cold-start/process-death).**
-  `MainActivity` gates `AppNavigation` behind `BiometricLockScreen` when `biometricLoginEnabled` and `sessionVerified`
+  `MainActivity` observes the lifecycle: while the lock is on and the session is unlocked, it records when the app is
-  is false; `sessionVerified` is a `remember{}` that resets on Activity recreation (cold-start, process death) — so the
+  backgrounded and **re-locks if it returns after >60s away** (`BIOMETRIC_RELOCK_GRACE_MS`) — so a picked-up, already-open
-  lock re-arms there — but a plain background→foreground without recreation keeps `sessionVerified = true`, so it may not
+  phone re-prompts, not only on Activity recreation. The grace window avoids re-locking on quick task-switches (the
-  re-prompt. Architecturally sound (no compose-tree bypass; content isn't composed until unlocked), but consider
+  biometric prompt, photo picker, share sheet). Code-complete + compiles; **live re-lock not yet driven** — emulators have
-  re-locking on `ON_STOP`/timeout so a picked-up unlocked phone re-prompts. *Prompted by:* R15 Pass M code audit (not
+  no enrolled biometric/PIN, so verify on a physical device. (SECURITY.md rec #7.)
-  live-tested — emulator has no enrolled biometric).
 
 > Artwork to generate (ChatGPT prompts, house-style-matched) lives in `ClaudeBrandingReview.md`, not here.
 

app/src/main/java/app/closer/MainActivity.kt

@@ -2,6 +2,7 @@ package app.closer
 
 import android.content.Intent
 import android.os.Bundle
+import android.os.SystemClock
 import android.util.Log
 import androidx.activity.compose.setContent
 import androidx.appcompat.app.AppCompatActivity
@@ -14,6 +15,7 @@ import androidx.compose.foundation.isSystemInDarkTheme
 import androidx.compose.material3.MaterialTheme
 import androidx.compose.material3.Surface
 import androidx.compose.runtime.Composable
+import androidx.compose.runtime.DisposableEffect
 import androidx.compose.runtime.LaunchedEffect
 import androidx.compose.runtime.SideEffect
 import androidx.compose.runtime.collectAsState
@@ -26,6 +28,9 @@ import androidx.core.content.ContextCompat
 import androidx.core.splashscreen.SplashScreen.Companion.installSplashScreen
 import androidx.core.view.WindowCompat
 import androidx.activity.result.contract.ActivityResultContracts
+import androidx.lifecycle.Lifecycle
+import androidx.lifecycle.LifecycleEventObserver
+import androidx.lifecycle.compose.LocalLifecycleOwner
 import androidx.lifecycle.lifecycleScope
 import android.Manifest
 import android.content.pm.PackageManager
@@ -52,6 +57,13 @@ import dagger.hilt.android.AndroidEntryPoint
 import java.io.File
 import javax.inject.Inject
 
+/**
+ * How long the app may sit in the background before the biometric app-lock re-arms. A short grace
+ * avoids re-locking on quick task-switches (the biometric prompt, a photo picker, the share sheet)
+ * while still re-prompting a picked-up phone that's been away for a while. SECURITY.md rec #7.
+ */
+private const val BIOMETRIC_RELOCK_GRACE_MS = 60_000L
+
 @AndroidEntryPoint
 class MainActivity : AppCompatActivity() {
     @Inject lateinit var settingsRepository: SettingsRepository
@@ -121,9 +133,34 @@ class MainActivity : AppCompatActivity() {
             }
 
             var sessionVerified by remember { mutableStateOf(false) }
-            val needsBiometricLock = settings.biometricLoginEnabled
+            val lockEnabled = settings.biometricLoginEnabled && authRepository.currentUserId != null
-                && authRepository.currentUserId != null
+
-                && !sessionVerified
+            // Auto re-lock: while unlocked, drop the verified session once the app has been in the
+            // background past the grace window, so a picked-up, already-open phone re-prompts — not
+            // only on cold-start. (Previously `sessionVerified` survived background→resume, so an
+            // unlocked phone stayed open indefinitely. SECURITY.md rec #7.)
+            if (lockEnabled && sessionVerified) {
+                val lifecycleOwner = LocalLifecycleOwner.current
+                DisposableEffect(lifecycleOwner) {
+                    var backgroundedAt = 0L
+                    val observer = LifecycleEventObserver { _, event ->
+                        when (event) {
+                            Lifecycle.Event.ON_STOP -> backgroundedAt = SystemClock.elapsedRealtime()
+                            Lifecycle.Event.ON_START ->
+                                if (backgroundedAt != 0L &&
+                                    SystemClock.elapsedRealtime() - backgroundedAt >= BIOMETRIC_RELOCK_GRACE_MS
+                                ) {
+                                    sessionVerified = false
+                                }
+                            else -> Unit
+                        }
+                    }
+                    lifecycleOwner.lifecycle.addObserver(observer)
+                    onDispose { lifecycleOwner.lifecycle.removeObserver(observer) }
+                }
+            }
+
+            val needsBiometricLock = lockEnabled && !sessionVerified
 
             CloserTheme(darkTheme = useDarkTheme) {
                 SideEffect {

app/src/main/java/app/closer/ui/pairing/CreateInviteScreen.kt

@@ -39,9 +39,13 @@ import androidx.compose.material3.TopAppBarDefaults
 import androidx.compose.runtime.Composable
 import androidx.compose.runtime.LaunchedEffect
 import androidx.compose.runtime.collectAsState
+import androidx.compose.material3.OutlinedTextField
+import androidx.compose.material3.OutlinedTextFieldDefaults
 import androidx.compose.runtime.getValue
+import androidx.compose.runtime.mutableStateOf
 import androidx.compose.runtime.remember
 import androidx.compose.runtime.rememberCoroutineScope
+import androidx.compose.runtime.setValue
 import androidx.compose.ui.Alignment
 import androidx.compose.ui.Modifier
 import androidx.compose.ui.graphics.Color
@@ -290,6 +294,48 @@ fun CreateInviteScreen(
                                 Spacer(Modifier.width(6.dp))
                                 Text("Copy phrase", style = MaterialTheme.typography.labelMedium)
                             }
+
+                            // Save-confirmation: prove you actually wrote it down by re-typing one
+                            // word. The phrase is the only way to recover your history, so don't let
+                            // pairing feel "done" until it's been saved. SECURITY.md rec #6.
+                            val phraseWords = remember(phrase) {
+                                phrase.trim().split(Regex("\\s+")).filter { it.isNotBlank() }
+                            }
+                            val challengeIndex = remember(phrase) {
+                                if (phraseWords.isEmpty()) 0 else phraseWords.indices.random()
+                            }
+                            var confirmWord by remember(phrase) { mutableStateOf("") }
+                            val confirmed = phraseWords.getOrNull(challengeIndex)
+                                ?.equals(confirmWord.trim(), ignoreCase = true) == true
+
+                            Spacer(Modifier.height(4.dp))
+                            if (confirmed) {
+                                Text(
+                                    "✓ Saved — you're all set.",
+                                    style = MaterialTheme.typography.labelMedium,
+                                    color = SettingsPrimaryDeep,
+                                    fontWeight = FontWeight.SemiBold
+                                )
+                            } else {
+                                Text(
+                                    "Confirm you saved it — type word #${challengeIndex + 1}.",
+                                    style = MaterialTheme.typography.labelMedium,
+                                    color = SettingsMuted
+                                )
+                                OutlinedTextField(
+                                    value = confirmWord,
+                                    onValueChange = { confirmWord = it },
+                                    singleLine = true,
+                                    modifier = Modifier.fillMaxWidth(),
+                                    shape = RoundedCornerShape(12.dp),
+                                    placeholder = { Text("word #${challengeIndex + 1}") },
+                                    colors = OutlinedTextFieldDefaults.colors(
+                                        focusedBorderColor = SettingsPrimaryDeep,
+                                        unfocusedBorderColor = SettingsMuted.copy(alpha = 0.4f),
+                                        cursorColor = SettingsPrimaryDeep
+                                    )
+                                )
+                            }
                         }
                     }
                 }

app/src/main/java/app/closer/ui/questions/LocalQuestionContent.kt

@@ -124,6 +124,11 @@ fun LocalQuestionContent(
                         onToggleHelp = {},
                         showHelp = false
                     )
+                    // Show the editable answer form only until it's saved. Once submitted, the
+                    // SubmittedAnswerCard below replaces it — leaving the form (with its "Save
+                    // privately" button) on screen after answering made it look like you still
+                    // needed to answer / could re-answer.
+                    if (!state.submitted) {
                         QuestionAnswerInput(
                             question = question,
                             pendingWrittenText = state.pendingWrittenText,
@@ -136,6 +141,7 @@ fun LocalQuestionContent(
                             canSubmit = canSubmit,
                             isSubmitting = false
                         )
+                    }
 
                     AnimatedVisibility(
                         visible = state.submitted,
@@ -250,10 +256,13 @@ private fun SubmittedAnswerCard(
     question: Question,
     state: LocalQuestionUiState
 ) {
-    val label = when {
+    // This card shows the user's OWN answer, so title it as such. The status line carries the
-        state.isRevealed -> "Answer revealed"
+    // shared state — the old "Answer revealed" title read as if both answers were shown here, when
-        !state.partnerHasAnswered -> "Private answer saved — waiting for partner"
+    // the mutual reveal actually lives behind the "View reveal" button.
-        else -> "Private answer saved"
+    val status = when {
+        state.isRevealed -> "Revealed together — open View reveal to compare"
+        !state.partnerHasAnswered -> "Saved privately — waiting for your partner"
+        else -> "Saved privately — ready to reveal together"
     }
     Surface(
         modifier = Modifier.fillMaxWidth(),
@@ -282,7 +291,7 @@ private fun SubmittedAnswerCard(
             }
             Column(verticalArrangement = Arrangement.spacedBy(3.dp)) {
                 Text(
-                    text = label,
+                    text = "Your answer",
                     style = MaterialTheme.typography.titleSmall,
                     color = MaterialTheme.colorScheme.onSurface,
                     fontWeight = FontWeight.SemiBold
@@ -290,10 +299,15 @@ private fun SubmittedAnswerCard(
                 Text(
                     text = answerSummary(question, state),
                     style = MaterialTheme.typography.bodyMedium,
-                    color = MaterialTheme.colorScheme.onSurfaceVariant,
+                    color = MaterialTheme.colorScheme.onSurface,
                     maxLines = 2,
                     overflow = TextOverflow.Ellipsis
                 )
+                Text(
+                    text = status,
+                    style = MaterialTheme.typography.bodySmall,
+                    color = MaterialTheme.colorScheme.onSurfaceVariant
+                )
             }
         }
     }