fix(ollama): show monthly cloud usage limit

[robinebers]

TL;DR

Ollama accounts with a monthly cloud allowance now show a Monthly meter. A reported limits.monthly.usage = 0.053 becomes 5.3% usage in the API and 5% used in the dashboard's existing whole-percentage format.

Fixes #1268.

What was happening

• The Ollama mapper read only Session and Weekly, silently discarding the Monthly allowance.
• A Free-plan response containing only Monthly usage and recent activity produced the spend row without a quota meter.

What this changes

• Read Monthly through the existing percentage helper and register its dashboard widget.
• Enable Monthly as Always Visible, after Weekly, without adding a menu-bar pin. Existing layouts receive it once; later opt-outs remain respected.
• Export monthly in /v1/limits and include its progress line in /v1/usage.
• Preserve omission of absent or unusable values, treat zero as real usage data, and supply no guessed reset date.
• Update the provider and API docs, and add regression coverage for mapping, widget data, API output, and layout upgrades.

Heads-up

Thanks to @maxmilian for identifying the missing Monthly mapping.

Tests

• Full SwiftPM suite: 1,384 tests, 3 skipped, zero failures. The local Xcode beta needed the downloaded Sparkle framework supplied through DYLD_FRAMEWORK_PATH for test loading.
• CONFIG=debug ./script/build_and_run.sh verify: rebuild, signing, restart, and process verification passed.
• Native dashboard screenshots reviewed for monthly-only Free and combined Session/Weekly/Monthly payloads.
• git diff --check passed.

Screenshots

Native captures of the dashboard header and metric rows using synthetic Free and Pro payloads, with the meter set to Used. The Free fixture supplies only Monthly; Session and Weekly correctly show No data.

Free	Pro

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Note

Low Risk
Scoped Ollama provider change with optional-field parsing unchanged; layout migration is tested and does not touch auth or shared infrastructure.

Overview
Ollama Cloud now surfaces Monthly plan usage when limits.monthly is present in /api/usage, fixing cases (e.g. Free) where only a monthly allowance was returned and no quota meter appeared.

The mapper adds a Monthly percent line via the same percentLine helper as Session/Weekly (fraction → %, no guessed resetsAt). A new ollama.monthly widget exports monthly to /v1/limits and /v1/usage. Default layout enables Monthly above the fold (after Weekly, not menu-bar pinned); upgrades add it once while respecting prior opt-outs. Docs and tests cover mapping edge cases, API projection, and layout migration.

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