Port upstream 0.66.0: Atlas Cloud typed balance and parity (stacked on #618)

[Finesssee]

Summary

Closes the parity gaps between Atlas Cloud in #618 and upstream 0.66.0:

• Balance is now a typed USD CostSnapshot (with_balance), so it reaches balance formatting, Usage & Spend, and currency conversion. It was an untyped display string without a $.
• A signed display row "Available balance" ($95.50, $0.00, -$1.25) is kept alongside the typed value, because CostSnapshot::with_balance clamps to >= 0 and upstream preserves zero and negative balances (see the correction comment on Port Atlas Cloud balance provider from v0.66.0 #618).
• Identity login method is API, as upstream sets identity.loginMethod = "API".
• One canonical dashboard URL, https://www.atlascloud.ai/console. settings::api_keys now reads atlascloud::DASHBOARD_URL instead of carrying a second, disagreeing literal.
• Upstream ProviderIcon-atlascloud.svg glyph added to the frontend icon registry (fill switched from #000 to currentColor so it tints with the brand color on the dark UI).

No wire-shape change: the endpoint, envelope checks, and status mapping are unchanged.

Upstream reference

• Release bullet: "Atlas Cloud: show account-wide available USD balance through the documented API-key endpoint (Add support for Atlas Cloud API steipete/CodexBar#2714)" (5cfe3f1f, feat(providers): add Atlas Cloud and Vercel balance plugins steipete/CodexBar#3917), v0.66.0.
• Tag-pinned files: Sources/CodexBarCore/Resources/Plugins/atlascloud.js (row "Available balance" via ctx.format.usd, identity.loginMethod = "API"), Sources/CodexBarCore/Providers/AtlasCloud/AtlasCloudProviderDescriptor.swift (dashboardURL), Sources/CodexBar/Resources/ProviderIcon-atlascloud.svg, Tests/CodexBarTests/APIBalancePluginTests.swift (zero and negative balances preserved).

Ported / Deferred

Ported: typed balance, signed display row, login method, single dashboard URL, frontend icon, tests for "-1.250000", "0.00", "", " ", NaN, 1e999, 0x10, "private-response", wrong object/scope/currency, and HTTP 400/401/403/429/503 without echoing the body.

Deferred:

• docs/logos/atlascloud.svg and the embedded serve-dashboard icon (rust/src/cli/serve/dashboard/icons/): that table is pinned to the v0.48.0 white-glyph set and upstream's Atlas glyph is black, so the colour treatment needs a separate decision. The dashboard falls back to its neutral dot meanwhile.
• Locale keys: no provider-specific UI strings were added, so there is nothing to translate.
• Retry-After handling: upstream only forwards it as metadata and does not opt into retryPolicy, so nothing to port.

Validation

• 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 atlascloud -- --test-threads=4: 11 passed
• cargo +1.98.0 test -p codexbar -- --test-threads=4 (full): 2275 passed, 0 failed, 1 ignored
• pnpm exec vitest run providerIcons.test.ts TrayPanel.test.tsx: 31 passed
• pnpm run lint: pre-existing warnings only; pnpm run build: pass

Affected areas

• Provider backend (rust/src/providers/atlascloud)
• Settings API-key catalog (dashboard URL only)
• Frontend icon registry (glyph asset only, no component change)
• Tray / settings / float bar behavior

UI proof

Pending: coordinator will capture CUA proof on a fresh build (tray card balance row and Atlas icon). Triage classed this port as not UI-affecting; the only visible change is the icon glyph and the $ balance text.

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