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feat: add AI writing help to new post screen

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Add on-device AI writing assistance using ML Kit GenAI APIs (Rewriting,
Proofreading) powered by Gemini Nano via Android AICore. Users can tap
the sparkle button in the compose toolbar to access tone chips (Correct,
Rephrase, Shorter, Elaborate, Friendly, Professional, More Direct,
Punchy, + Emoji) that transform their post text. Results appear in a
card with Use/Dismiss actions.

- Play flavor: MLKitWritingAssistant using on-device Gemini Nano
- F-Droid flavor: NoOpWritingAssistant stub (returns unavailable)
- WritingAssistant interface for future DVM/NIP90 integration
- AI button hidden on unsupported devices

Also fixes pre-existing exhaustive when expression in
DecryptAndIndexProcessor for GroupEventResult.Duplicate.

https://claude.ai/code/session_01RbCYGrbbapRMike8WQy41F
This commit is contained in:
Claude
2026-04-08 12:47:23 +00:00
parent 5e93ff0532
commit 7ae536e80d
14 changed files with 641 additions and 1 deletions
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gradle/libs.versions.toml
+6
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@@ -30,6 +30,9 @@ kotlin = "2.3.20"
kotlinxCollectionsImmutable = "0.4.0"
kotlinxCoroutinesCore = "1.10.2"
kotlinxSerialization = "1.10.0"
genaiProofreading = "1.0.0-beta1"
genaiPrompt = "1.0.0-beta2"
genaiRewriting = "1.0.0-beta1"
languageId = "17.0.6"
lifecycleRuntimeKtx = "2.10.0"
lightcompressor-enhanced = "1.8.1"
@@ -134,6 +137,9 @@ jetbrains-compose-runtime = { module = "org.jetbrains.compose.runtime:runtime",
jetbrains-compose-ui = { module = "org.jetbrains.compose.ui:ui", version.ref = "jetbrainsCompose" }
jetbrains-compose-ui-tooling = { module = "org.jetbrains.compose.ui:ui-tooling", version.ref = "jetbrainsCompose" }
jetbrains-compose-ui-tooling-preview = { module = "org.jetbrains.compose.ui:ui-tooling-preview", version.ref = "jetbrainsCompose" }
google-mlkit-genai-proofreading = { group = "com.google.mlkit", name = "genai-proofreading", version.ref = "genaiProofreading" }
google-mlkit-genai-prompt = { group = "com.google.mlkit", name = "genai-prompt", version.ref = "genaiPrompt" }
google-mlkit-genai-rewriting = { group = "com.google.mlkit", name = "genai-rewriting", version.ref = "genaiRewriting" }
google-mlkit-language-id = { group = "com.google.mlkit", name = "language-id", version.ref = "languageId" }
google-mlkit-translate = { group = "com.google.mlkit", name = "translate", version.ref = "translate" }
jackson-module-kotlin = { group = "com.fasterxml.jackson.module", name = "jackson-module-kotlin", version.ref = "jacksonModuleKotlin" }