perf(compose): add stability configuration for non-Compose model types (#855)

* perf(compose): add stability configuration for non-Compose model types

Adds compose_compiler_config.conf and wires it into both the library
Compose convention plugin and the app module. This tells the Compose
compiler to treat key model types from non-Compose modules as stable,
enabling skipping optimizations for composables that accept them.

Covered types:
- Solana key hierarchy (Key32, PublicKey, Mint)
- Financial models (Fiat, Rate, LocalFiat, MintMetadata,
  TokenWithBalance, TokenWithLocalizedBalance, etc.)
- Social links (sealed interface + subtypes)
- Bill customizations (contains ByteArray with custom equals)
- JDK/Kotlin time types (java.time.Instant, kotlin.time.Instant)

* refactor(compose): remove legacy Fiat, KinAmount, and related dead types

Delete com.getcode.model.Fiat, GenericAmount, SocialUser, TwitterUser
from libs/models and KinAmount + KinAmountExt from libs/currency.
Stub chat Exchange/MessageTip/payment code with TODO(chat-v2) comments
for reimplementation with OCP Fiat. Remove KinAmount overloads from
PriceWithFlag and Currency.format. Clean up stability config.

* chore(crypto): remove dead legacy Timelock, AgoraMemo, and PDA code

These Solana program instruction files in libs/crypto are superseded
by services/opencode equivalents and have zero external consumers.

* chore(crypto): remove dead legacy Solana instruction/transaction code

Delete 37 files (25 main + 12 tests) from libs/crypto/solana that are
fully superseded by services/opencode equivalents with zero external
consumers. Retains only the RPC layer (Calls, Requests, RpcConfig)
and SolanaModule used by PhantomWalletController.

Author: bmc08gt

apps/flipcash/app/build.gradle.kts

@@ -118,6 +118,12 @@ bugsnag {
     }
 }
 
+composeCompiler {
+    stabilityConfigurationFile.set(
+        rootProject.layout.projectDirectory.file("compose_compiler_config.conf")
+    )
+}
+
 kotlin {
     jvmToolchain {
         languageVersion.set(JavaLanguageVersion.of(libs.versions.android.java.get()))

build-logic/convention/src/main/kotlin/AndroidLibraryComposeConventionPlugin.kt

@@ -5,6 +5,7 @@ import org.gradle.api.artifacts.VersionCatalogsExtension
 import org.gradle.kotlin.dsl.configure
 import org.gradle.kotlin.dsl.dependencies
 import org.gradle.kotlin.dsl.getByType
+import org.jetbrains.kotlin.compose.compiler.gradle.ComposeCompilerGradlePluginExtension
 
 class AndroidLibraryComposeConventionPlugin : Plugin<Project> {
     override fun apply(target: Project) {
@@ -20,6 +21,12 @@ class AndroidLibraryComposeConventionPlugin : Plugin<Project> {
                 }
             }
 
+            extensions.configure<ComposeCompilerGradlePluginExtension> {
+                stabilityConfigurationFile.set(
+                    rootProject.layout.projectDirectory.file("compose_compiler_config.conf")
+                )
+            }
+
             val libs = extensions.getByType<VersionCatalogsExtension>().named("libs")
 
             dependencies {

compose_compiler_config.conf

@@ -0,0 +1,36 @@
+// Compose Compiler Stability Configuration
+// Types listed here are treated as stable by the Compose compiler,
+// enabling skipping optimizations for composables that accept them.
+//
+// Only types from non-Compose modules (where @Stable/@Immutable cannot
+// be applied directly) belong here.
+
+// Kotlin / JDK time types
+kotlin.time.Instant
+java.time.Instant
+
+// Solana key hierarchy (open class chain with List<Byte> internals)
+com.getcode.solana.keys.Key32
+com.getcode.solana.keys.PublicKey
+com.getcode.solana.keys.Mint
+
+// Financial model types (services/opencode — no Compose dependency)
+com.getcode.opencode.model.financial.Fiat
+com.getcode.opencode.model.financial.Rate
+com.getcode.opencode.model.financial.LocalFiat
+com.getcode.opencode.model.financial.MintMetadata
+com.getcode.opencode.model.financial.TokenWithBalance
+com.getcode.opencode.model.financial.TokenWithLocalizedBalance
+com.getcode.opencode.model.financial.VmMetadata
+com.getcode.opencode.model.financial.LaunchpadMetadata
+com.getcode.opencode.model.financial.HolderMetrics
+com.getcode.opencode.model.financial.HolderMetrics.HolderDelta
+com.getcode.opencode.model.financial.SocialLink
+com.getcode.opencode.model.financial.SocialLink.Website
+com.getcode.opencode.model.financial.SocialLink.X
+com.getcode.opencode.model.financial.SocialLink.Telegram
+com.getcode.opencode.model.financial.SocialLink.Discord
+
+// Bill customization (contains ByteArray, custom equals)
+com.getcode.opencode.model.ui.TokenBillCustomizations
+