Port upstream 0.66.0: MiniMax browser storage discovery (stacked on #646)

[Finesssee]

Summary

Stacked on #646 (shared Chromium LevelDB reader). Adds browser::storage_discovery, a shared, read-only locator for raw Chromium profile stores, and switches the MiniMax browser-storage importer to it.

• storage_discovery::discover(StorageKind) walks every installed Chromium-family browser in the BrowserType catalog and returns candidate directories: Local Storage/leveldb, Session Storage, or IndexedDB/<origin>.indexeddb.leveldb filtered by origin prefixes. Profiles are Default, Profile *, and user-* (sorted; hidden entries, files, and guest/system profiles ignored). Nothing is opened, locked, or decrypted.
• MiniMaxLocalStorageImporter::import_session previously looked only at the Default profile of Chrome, Edge, and Brave Local Storage (per-OS hard-coded paths). It now visits every catalog browser and profile, trying Local Storage first, then Session Storage, then MiniMax-origin IndexedDB only when earlier stores yield no session. source_label is now the candidate label (for example Google Chrome Profile 2 (Session Storage)).
• MiniMax IndexedDB origin prefixes match upstream: https_platform.minimax.io_, https_www.minimax.io_, https_minimax.io_, https_platform.minimaxi.com_, https_minimaxi.com_, https_www.minimaxi.com_.

No user-visible change yet: MiniMaxLocalStorageImporter is still not called by the MiniMax fetch path (it uses API key or cookie header only), as noted in the 0.66.0 audit.

Upstream reference

• Release bullet: "MiniMax: discover browser session storage across the shared Chromium catalog, including Comet and Yandex (fix(devin): share Chromium browser session discovery steipete/CodexBar#3883)", v0.66.0, commit 62cdd065.
• Tag-pinned files: Sources/CodexBarCore/ChromiumLocalStorageDiscovery.swift (Storage enum, profileCandidates), Sources/CodexBarCore/Providers/MiniMax/MiniMaxLocalStorageImporter.swift (indexedDBStorage, storageCandidates, local, session, then IndexedDB order), Tests/CodexBarTests/MiniMaxLocalStorageImporterTests.swift (allowed and excluded IndexedDB fixture names, profile-name filter), docs/minimax.md.

Ported / Deferred

Ported: the three-storage discovery, profile filter, IndexedDB origin-prefix filter, and MiniMax fallback order.

Deferred:

• Comet and Yandex: not in BrowserType, and upstream evidence gives macOS roots only, so their Windows User Data paths would be invented. Other upstream catalog members (Chrome Beta/Canary, Edge Beta/Canary, Brave Beta/Nightly, Vivaldi, Dia, Atlas, Helium) are likewise outside BrowserType; extending it belongs with the Chrome-channel work (feat(browser): support Chrome channels and Chromium profiles #614). Adding a browser there makes it visible to this discovery with no change here.
• The MiniMax importer still string-scans .ldb/.log files rather than using the Port upstream 0.66.0: shared Chromium LevelDB + Snappy reader #646 LevelDB reader (Snappy-compressed tables are invisible to a raw scan). Switching the parse to the reader, and wiring the importer into the fetch path, are separate behavior changes.
• Live-profile smoke check: not run (no real-browser data access in this task); coverage is fixture-based on temp directories.

Validation

Toolchain cargo +1.98.0, slot-4 target dir, E-core wrappers.

• cargo +1.98.0 fmt --all: clean
• cargo +1.98.0 clippy --workspace --all-targets -- -D warnings: pass
• cargo +1.98.0 test -p codexbar storage -- --test-threads=4: 14 passed, 0 failed (includes the 4 new discovery tests and 3 new importer tests)
• cargo +1.98.0 test -p codexbar -- minimax browser:: --test-threads=4: 84 passed, 0 failed

New tests: per-kind path and label resolution, missing stores and missing user-data dir, profile-name filter and ordering (Default, Profile 2, user-work kept; Guest Profile, System Profile, Profile1, hidden, and file entries dropped), IndexedDB allow/exclude list from the upstream fixture (18 candidates across 3 profiles), and importer order (local beats session, session and IndexedDB fallback, no-browser vs no-session errors). Full cargo test -p codexbar not run (no shared core code touched).

Affected areas

• Rust backend (rust/src/browser/, rust/src/providers/minimax/local_storage.rs)
• Tauri shell
• Frontend
• Settings / bridge types
• No new dependencies. No file over 1000 lines.

UI proof

Not applicable

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