Fix MiniMax coding-plan fetch + OpenCode Go percent scaling (fixes #246, #247)

[Finesssee]

Fixes

• Fixes [Bug]: MiniMax provider fails to fetch usage with web session (billing returns 500) #246 — MiniMax provider fails with web session (MiniMax billing returned status 500)
• Fixes [Bug] OpenCode Go: rolling 5-hour usage shows 100% / "Exhausted Weekly" when opencode.ai reports 1% #247 — OpenCode Go rolling 5-hour usage shows 100% at 1%

What changed

MiniMax (#246) — the cookie/web path depended solely on the billing-history endpoint (/account/amount), which returns HTTP 500 for coding-plan accounts. Ported the upstream cookie/web fetch: coding-plan page (/user-center/payment/coding-plan?cycle_type=3) → JSON / __NEXT_DATA__ / visible-text HTML scrape → coding_plan/remains fallback chain (platform host, then www host; retry only on 404/405/network/parse). Billing history stays as best-effort enrichment — its failure, including the reported 500, no longer kills the fetch. Auto/Web now fall back to browser cookies when no manual cookie is set (same convention as the other web providers). 1004/login strings map to AuthRequired. Parser lives in minimax/coding_plan.rs (JSON/remains) + minimax/coding_plan_html.rs (HTML scrape), upstream-formula parity with MiniMaxUsageFetcher.swift.

OpenCode Go (#247) — extract_window() scaled direct percent fields ≤ 1.0 by 100 ("fraction heuristic"), turning the server's integer usagePercent: 1 into a false 100% / "Exhausted Weekly". Removed the scaling; direct percent fields pass through (upstream parseSubscription parity). Regression test uses the reporter's exact $R[...] payload.

Main repairs included (separate tiny commits, were breaking CI at HEAD): TS build fix from the UI split (MenuCardDetails/providerGridUtils.test), and hermetic cost-scan tests (skip the real-home pi session sweep when tests inject sessions roots). Full detail in commit bodies.

Validation

• rust/ full suite: 848 lib + 1 bin, 0 failed
• Tauri crate: 326 passed
• Frontend: tsc clean, vite build ok, 210 Vitest tests, check-locale 712 keys OK
• cargo clippy both crates -D warnings; cargo fmt --check clean
• scripts\local-check.ps1: exit 0 — Local checks passed.
• No UI/tray/settings changes → CUA not applicable
• MiniMax live end-to-end needs a real coding-plan account; parser is fixture-covered against upstream's exact wire shapes. Reporter verification requested after release.

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[Finesssee]

Merged 🎉 Thank you @makssiful and @CarlosLongarela for the precise reports — #247 included the exact root-cause line range and live payload, #246 the browser network trace, both made the fix straightforward. The fixes ship in the next release; miniMax users hit the coding-plan fallback automatically (billing 500 no longer breaks the tray). Issues #246 and #247 close automatically with this merge; please report back after upgrading.