feat: OpenCode Go local-first Auto, adaptive refresh, cost JSONL tails (0.45 deferred)

[Finesssee]

Summary

Ports three deferred 0.45 items onto the Tauri/Windows tree:

1. OpenCode Go local-first Auto (upstream steipete#2316)

• New rust/src/providers/opencodego/local.rs reads local opencode.db via rusqlite
• Paths: %USERPROFILE%\.local\share\opencode\, %LOCALAPPDATA%\opencode\, $HOME/.local/share/opencode/
• Session $12/5h, weekly $30, monthly $60 cost windows; prefers step-finish parts when present
• Auto: local first unless workspace_id / token-account / manual cookie scopes web first
• Web: web only; Cli: local only
• available_sources: Auto, Web, Cli

2. Adaptive refresh (upstream AdaptiveRefreshPolicyCore)

• Pure policy module rust/src/core/adaptive_refresh.rs with the decision table
• Settings flag adaptive_refresh + General tab Adaptive option
• auto_refresh.rs uses adaptive delays when enabled; tracks last menu open / activity
• Windows low-power: simple battery/AC + battery-saver heuristic (nominal thermal)

3. Cost incomplete tails

• Claude cost scanner uses read_until so a final incomplete JSONL line is processed when valid UTF-8 JSON

Tests

cargo test --manifest-path rust/Cargo.toml --lib opencodego
cargo test --manifest-path rust/Cargo.toml --lib adaptive_refresh
cargo test --manifest-path rust/Cargo.toml --lib claude_scan_counts_final
cargo test --manifest-path rust/Cargo.toml --lib locale::
cargo test --manifest-path rust/Cargo.toml --lib settings::
cargo test --manifest-path apps/desktop-tauri/src-tauri/Cargo.toml auto_refresh -- --test-threads=1

Notes

• No packaging / version bump

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