fix(android): persist prefs/logs under app filesDir

[HKLHaoBin]

User description

Summary

Fixes Honor / Huawei devices where Settings → Services provider switches and preference saves fail with generic「操作失败」.

Root cause: On Android, Coordinator::new() ran before JNI Context was ready. data_dir() fell back to std::env::temp_dir() (/data/local/tmp), which the app sandbox cannot write. PreferencesStore then degraded to openless_prefs_fallback.json under /data/local/tmp, so every updatePrefs / set_settings write failed.

This PR also includes SAF content:// log export (dialog save URI) and multi-path lookup for openless.log once file logging is created under files/logs/.

Related to #865 — this PR fixes preferences / shared data_dir persistence and log export only. It does not change CredentialsVault / Android Keystore / set_credential. If「只保存 API Key」still fails after this lands, that needs a separate follow-up.

Error UX: Settings toasts remain generic「操作失败」; we intentionally do not surface Rust error strings in ProvidersSection. Use Advanced → Debug tools → Export log for details.

Changes

• Add persistence/android_storage.rs: resolve filesDir via JNI + OnceLock; never use /data/local/tmp for persistence
• mobile_runtime: init_android_storage_roots → init_file_logger → Coordinator::new → app.manage inside setup()
• Android store fallbacks use memory-only empty paths instead of temp files
• StylePack: refuse persisting icons when asset_root is empty (memory-only fallback)
• Coordinator degrade logs: Android-only suffix for /data/local/tmp note
• log_dir_path() → {filesDir}/logs; export via ContentResolver for SAF URIs
• Kotlin: prefer filesDir/OpenLess for overlay prefs reads

Not included: ADB specialist debug kit, CI workflow changes, specialist-only UI, or credential storage changes.

Test plan

• CI: Android APK succeeded on this branch
• Honor device: adb install -r (no pm clear)
• Settings → Services: switch ASR/LLM →「已保存」; logcat has no openless_prefs_fallback
• run-as com.openless.app ls files/OpenLess files/logs shows preferences.json and openless.log
• Advanced → Debug → Export error log via SAF succeeds

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PR Type

Bug fix, Tests

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Description

• Fix Honor settings saves by using app filesDir.

• Initialize storage roots before Coordinator in setup.

• Add SAF content:// log export via ContentResolver.

• Make Android fallback stores memory-only with empty paths.

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Diagram Walkthrough

flowchart LR
    A["Android setup()"] --> B["init_android_storage_roots (JNI filesDir)"]
    B --> C["file logger + Coordinator"]
    C --> D["persistence stores under filesDir/OpenLess"]
    D --> E["settings saves work"]
    F["export_error_log"] --> G["content:// URI"]
    G --> H["OpenLessContentWriter.writeBytes"]

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File Walkthrough

	Relevant files
Enhancement	2 files jni.rs Add JNI write_content_uri SAF helper                                          +32/-0    OpenLessContentWriter.kt Add Kotlin ContentResolver SAF writer                                        +37/-0
Bug fix	13 files misc.rs Route log export via content URI on Android                            +44/-6    lib.rs Use Android filesDir logs and improve logger init                +27/-7    mobile_runtime.rs Initialize Coordinator after Android storage roots              +16/-6    android_storage.rs Add Android storage roots resolver and unit tests                +198/-0  correction.rs Use memory-only fallback path on Android                                  +2/-2      dictionary.rs Use memory-only fallback path on Android                                  +2/-2      history.rs Use memory-only fallback path on Android                                  +3/-4      mod.rs Add empty path guard and Android data_dir                                +35/-5    preferences.rs Use memory-only fallback path on Android                                  +3/-2      style_pack.rs Use memory-only fallback path on Android                                  +7/-4      style_pack_archive.rs Guard empty asset root and add test                                            +35/-0    utils.ts Omit dialog filters on Android for save export                      +13/-4    OpenLessAndroidPreferences.kt Prefer filesDir when reading Android preferences                  +3/-1
Logging	1 files coordinator.rs Add Android degrade log suffix                                                      +20/-5
Error handling	1 files DebugToolsSection.tsx Show export error message in debug tools                                  +2/-1
Dependencies	2 files package.json Bump plugin-dialog dependency to 2.7.2                                      +1/-1      Cargo.toml Bump tauri-plugin-dialog to 2.7.2                                                +1/-1
Configuration changes	1 files copy-android-scaffolding.mjs Include OpenLessContentWriter in Kotlin scaffolding            +1/-0

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[github-actions]

PR Reviewer Guide 🔍

(Review updated until commit 10b3c02)

Here are some key observations to aid the review process:

🎫 Ticket compliance analysis 🔶 865 - Partially compliant Compliant requirements: Preference and shared data persistence now use app-private filesDir (never /data/local/tmp). Coordinator creation moved into Tauri setup() after Android storage roots are initialized, avoiding JNI-context-not-ready failures. Log export supports SAF content:// URIs and searches multiple openless.log candidate paths. Added diagnostics for store/logger init failures and Android-specific degrade notes. Unit tests added for Android storage path resolution and empty asset root behavior. Non-compliant requirements: Provider credential save via Android Keystore (set_credential / CredentialsVault) is not changed, so API key saving may still fail where the Keystore is the problem. Settings toasts remain generic "操作失败"; Rust error strings are not surfaced in ProvidersSection, so failure details are not shown to the user at the point of failure. No WebView/UA detection or minimum-Chromium guard was added. Requires further human verification: On-device testing on Honor/Huawei (Magic UI 4.0) to confirm provider switches and preference saves persist across restarts. On-device verification of API key / endpoint / model saving; if still failing, Keystore follow-up is required. Manual verification of exported log contents and the DebugTools error message rendering on Android.

⏱️ Estimated effort to review: 3 🔵🔵🔵⚪⚪

🧪 PR contains tests

🔒 No security concerns identified

⚡ No major issues detected

[github-actions]

Persistent review updated to latest commit 10b3c02

[HKLHaoBin]

旧结论已不适用于新内容。