Remove dead code, resources and build config

[dadachi]

Phase 3 (dead code removal). Every deletion was checked by grepping Kotlin, XML, the manifest, navigation, Gradle and ProGuard files. Reflection was ruled out too: the app never calls getIdentifier, and every Json that decodes the models sets ignoreUnknownKeys.

Changes

• NetModule.okHttpCallFactory(): nothing injects Call.Factory; Retrofit uses provideOkHttp. This unused client also logged full request and response bodies, unredacted, in debug builds.
• model/proguard-rules.pro: no build reads it. :model doesn't minify and doesn't list it in consumerProguardFiles. Its only line, -keep com...model.**, was malformed: it has no class keyword. Removed the file and the no-op release {} block that pointed to it.
• Hilt test modules (TestDispatcherModule, TestDispatchersModule, TestCryptoModule, TestDataStoreModule): no test is @HiltAndroidTest and the test source set has no Hilt processor, so Hilt never installs them. With them gone nothing uses hilt-android-testing, so I removed it from app/build.gradle.kts and from the version catalog. InMemoryDataStore stays because tests use it.
• Unused resources (lint UnusedResources reported all of them):
  • strings instructions, open, role, unauthorized, cancel, shop_name_is_required, removed from values and values-ja together
  • drawable/ic_placeholder_default
  • mipmap/ic_launcher_round: the manifest has no android:roundIcon
• Model:
  • Shopkeeper is never used; sign-in and sign-up use LoggedInShopkeeper.
  • Shopkeepers and Relationships.shopkeepers are for organizations, which the Free edition doesn't have; nothing reads them.
  • Attributes.shopkeeperId, ownerId, ownerName, isAdmin and shopsCount are never read.
  • Data.getCreatedAt and ItemTag.getCreatedAt have no callers.
• kotlin.parcelize plugin in :app: no app source uses @Parcelize. :model keeps the plugin. The release R8 seeds are unchanged apart from the deleted classes.
• App ProGuard rules that repeat library rules: the -dontwarn lines for bouncycastle, conscrypt and openjsse are covered by OkHttp's own rules, and the Response/Continuation keeps by Retrofit's. With these rules removed, the release classes.dex is byte-identical (same md5). The retrofit2.Call, GeneratedMessageLite and @Parcelize rules stay: removing the Call or Parcelize rule does change the dex.
• Separate text fix (from paid #107): sent_reset_password_instruction and sent_confirmation_instruction read "An email has been sent the email containing ...", and the reset one had a stray ". Both now say what the Japanese text already says. The test was ported from paid SentInstructionsMessagesTest. Red check: both tests failed on the old strings, then passed after the fix.

Not done (considered)

• docs/images/nfc.gif (15 MB), screenshots_nfc.png and overview_before/after.png are not referenced in the repo, but they may be linked from outside (website or blog), so I left them.
• Some model getters and fields are used only by tests (ItemTag.getPosition/getShopName/getShopId/getState, Attributes.createdAt/updatedAt, Meta.totalCount). They mirror the API schema, so I left them.
• The proto DataStore fields stay because they are needed for compatibility with stored data.

Checks

• ./gradlew :app:compileDebugKotlin builds with no warnings.
• Pre-push steps: spotless, lintDebug, :app:minifyReleaseWithR8 and test all pass. The Gradle daemon crashed during lint because of concurrent builds, so I re-ran those steps with --no-daemon.
• 352 test cases, 0 failures (debug, release and :model).
• ./gradlew :app:assembleRelease passes.
• Device (Pixel 1C081FDF600CMG, debug build against the local API): launched while signed in. The shop list and Sample Shop's item tags load and decode correctly, with no crashes. Everything else in this PR is a deletion with no runtime effect.

🤖 Generated with Claude Code

https://claude.ai/code/session_01K5hZEFqXhBsUQwSWsgR6eH