docs(02): add missing auth store actuals to plan

.planning/phases/02-authentication-foundation/02-03-PLAN.md

@@ -17,7 +17,9 @@ files_modified:
   - iosApp/iosApp/iOSApp.swift
   - iosApp/Podfile
   - composeApp/src/jvmMain/kotlin/dev/ulfrx/recipe/auth/OidcClient.jvm.kt
+  - composeApp/src/jvmMain/kotlin/dev/ulfrx/recipe/auth/SecureAuthStateStore.jvm.kt
   - composeApp/src/webMain/kotlin/dev/ulfrx/recipe/auth/OidcClient.wasmJs.kt
+  - composeApp/src/webMain/kotlin/dev/ulfrx/recipe/auth/SecureAuthStateStore.wasmJs.kt
   - composeApp/src/commonTest/kotlin/dev/ulfrx/recipe/auth/SecureAuthStateStoreContractTest.kt
 autonomous: true
 requirements: [AUTH-01, AUTH-02, AUTH-04, AUTH-05]
@@ -26,6 +28,7 @@ must_haves:
     - "iOS and Android login use AppAuth authorization-code flow with PKCE through system browser and recipe://callback"
     - "Requested scopes are exactly openid profile email offline_access"
     - "AuthState JSON is stored through explicit iOS Keychain and Android EncryptedSharedPreferences-backed stores"
+    - "Every configured KMP target has a SecureAuthStateStore actual, including JVM and Wasm stubs"
     - "JVM target has DEV_AUTH_TOKEN dev stub; Wasm target throws NotImplementedError(\"Wasm OIDC: v2\")"
     - "Logout platform clients support RP-initiated end-session and local store clearing"
   artifacts:
@@ -38,6 +41,12 @@ must_haves:
     - path: "composeApp/src/iosMain/kotlin/dev/ulfrx/recipe/auth/SecureAuthStateStore.ios.kt"
       provides: "iOS Keychain storage with AfterFirstUnlockThisDeviceOnly per D-14"
       contains: "kSecAttrAccessibleAfterFirstUnlockThisDeviceOnly"
+    - path: "composeApp/src/jvmMain/kotlin/dev/ulfrx/recipe/auth/SecureAuthStateStore.jvm.kt"
+      provides: "JVM dev-only in-memory AuthState store actual so desktop tests compile"
+      contains: "actual class SecureAuthStateStore"
+    - path: "composeApp/src/webMain/kotlin/dev/ulfrx/recipe/auth/SecureAuthStateStore.wasmJs.kt"
+      provides: "Wasm non-persistent AuthState store actual so wasm target compiles while OIDC remains v2"
+      contains: "actual class SecureAuthStateStore"
     - path: "iosApp/iosApp/Info.plist"
       provides: "recipe URL scheme registration"
       contains: "CFBundleURLSchemes"
@@ -148,18 +157,24 @@ Output: expect/actual OIDC client, explicit secure auth state store, URL callbac
     - composeApp/src/jvmMain/kotlin/dev/ulfrx/recipe/main.kt
     - composeApp/src/webMain/kotlin/dev/ulfrx/recipe/main.kt
   </read_first>
-  <files>composeApp/src/jvmMain/kotlin/dev/ulfrx/recipe/auth/OidcClient.jvm.kt, composeApp/src/webMain/kotlin/dev/ulfrx/recipe/auth/OidcClient.wasmJs.kt</files>
+  <files>composeApp/src/jvmMain/kotlin/dev/ulfrx/recipe/auth/OidcClient.jvm.kt, composeApp/src/jvmMain/kotlin/dev/ulfrx/recipe/auth/SecureAuthStateStore.jvm.kt, composeApp/src/webMain/kotlin/dev/ulfrx/recipe/auth/OidcClient.wasmJs.kt, composeApp/src/webMain/kotlin/dev/ulfrx/recipe/auth/SecureAuthStateStore.wasmJs.kt</files>
   <action>
     JVM actual reads `DEV_AUTH_TOKEN` from environment and returns `OidcResult.Success(authStateJson = "dev:$token", accessToken = token, idToken = null, expiresAtEpochMillis = Long.MAX_VALUE)` when present. If missing, return `OidcResult.AuthError("DEV_AUTH_TOKEN is not set")`; do not hardcode a usable bearer token.
 
+    JVM `SecureAuthStateStore` actual must compile for desktop dev/tests without pretending to be production secure storage. Implement `actual class SecureAuthStateStore` with a private nullable in-memory `authStateJson` property and exact methods `read()`, `write(authStateJson: String)`, and `clear()`. This store is dev-only and process-local; do not use it for mobile targets.
+
     Wasm actual throws exactly `NotImplementedError("Wasm OIDC: v2")` for login/refresh/logout per D-03.
+
+    Wasm `SecureAuthStateStore` actual must also exist so `:composeApp:compileKotlinWasmJs` compiles. Implement `actual class SecureAuthStateStore` with the same private nullable in-memory `authStateJson` property and `read()`, `write(authStateJson: String)`, `clear()` methods. Because Wasm OIDC itself throws `NotImplementedError("Wasm OIDC: v2")`, this store is non-persistent and only satisfies the KMP actual contract.
   </action>
   <verify>
     <automated>./gradlew :composeApp:jvmTest :composeApp:compileKotlinWasmJs</automated>
   </verify>
   <acceptance_criteria>
     - `grep -q 'DEV_AUTH_TOKEN' composeApp/src/jvmMain/kotlin/dev/ulfrx/recipe/auth/OidcClient.jvm.kt`
+    - `grep -q 'actual class SecureAuthStateStore' composeApp/src/jvmMain/kotlin/dev/ulfrx/recipe/auth/SecureAuthStateStore.jvm.kt`
     - `grep -q 'NotImplementedError("Wasm OIDC: v2")' composeApp/src/webMain/kotlin/dev/ulfrx/recipe/auth/OidcClient.wasmJs.kt`
+    - `grep -q 'actual class SecureAuthStateStore' composeApp/src/webMain/kotlin/dev/ulfrx/recipe/auth/SecureAuthStateStore.wasmJs.kt`
     - `./gradlew :composeApp:jvmTest :composeApp:compileKotlinWasmJs` exits 0
   </acceptance_criteria>
   <done>Secondary targets compile without expanding Phase 2 scope into real Desktop/Wasm OIDC.</done>