feat(frontend/recs): render Azure Savings Plans rows + column visibility

[cristim]

Closes #658.

Root cause

isSavingsPlanService in frontend/src/lib/purchase-compatibility.ts matched startsWith('savings-plans') only. The Azure SP client (providers/azure/services/savingsplans/client.go) reports service = "savingsplans" (no hyphen), identical to Go's common.ServiceSavingsPlans umbrella constant. Go's IsSavingsPlan handles this with an explicit equality check (string(s) == "savingsplans"); the frontend did not mirror it, so:

1. Azure SP rows were excluded from the 'All Savings Plans' tri-state toggle in the service filter popover.
2. Azure SP recs were NOT collapsed into the canonical 'savings-plans' bulk-buy bucket — they got their own 'savingsplans' bucket key, breaking the one-bucket SP experience.

Fix

• Extended isSavingsPlanService to match both 'savings-plans' and 'savingsplans'.
• New UMBRELLA_SLUGS set to unify the 'skip in label' guard for both spellings.
• savingsPlansBucketLabel falls back gracefully to 'Savings Plans' for Azure SP buckets.

Tests

• 3 new tests in purchase-compatibility.test.ts (Azure SP slug recognition)
• 5 new tests in recommendations.test.ts (Azure SP rows appear; SP group toggle includes savingsplans slugs; bulk-buy bucketing uses canonical SP bucket key)
• 1939 tests pass total (+25 net)

Summary by CodeRabbit

• New Features

  • Added support for Azure Savings Plans across service filtering, column filters, and recommendation bucketing.
  • Service column filter toggles now correctly display "All Savings Plans" when Azure Savings Plans are included.

• Bug Fixes

  • Improved plan type label rendering to display "Savings Plans" without internal identifiers.

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ℹ️ Recent review info

⚙️ Run configuration

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Run ID: e4092102-58bb-4021-8557-59c82f3fb63a

📥 Commits

Reviewing files that changed from the base of the PR and between 5abf40b and 038ed97.

📒 Files selected for processing (3)

• frontend/src/__tests__/purchase-compatibility.test.ts
• frontend/src/__tests__/recommendations.test.ts
• frontend/src/lib/purchase-compatibility.ts

---

📝 Walkthrough

Walkthrough

This PR extends the frontend recommendations table to surface Azure Savings Plans rows alongside AWS Savings Plans. Core logic in purchase-compatibility.ts now recognizes the Azure umbrella slug "savingsplans" and excludes it from bucket labels. Integration tests verify rendering, service column visibility, and bulk-buy bucketing.

Changes

Azure Savings Plans Frontend Integration

Layer / File(s)	Summary
Core Savings Plans service detection and labeling frontend/src/lib/purchase-compatibility.ts, frontend/src/__tests__/purchase-compatibility.test.ts	isSavingsPlanService() now recognizes the Azure umbrella slug "savingsplans" in addition to savings-plans* prefix matching. savingsPlansBucketLabel() filters out umbrella Savings Plans slugs from the parenthetical plan-type list. Unit tests validate both behaviors with the Azure slug and fallback label rendering.
Recommendations table Azure Savings Plans integration tests frontend/src/__tests__/recommendations.test.ts	Integration tests validate that Azure Savings Plans recommendations render in the table with service badges appearing in the table and service column-filter popover. Tests also verify bulk-buy fan-out correctly buckets Azure SP recs under the canonical service="savings-plans" bucket key alongside AWS Savings Plans types, covering both single-bucket and multi-provider scenarios.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~12 minutes

Possibly related PRs

• LeanerCloud/CUDly#180: Modifies frontend/src/lib/purchase-compatibility.ts and its tests around Savings Plans detection and labeling for service slug grouping and rendering.
• LeanerCloud/CUDly#181: Extends isSavingsPlanService() to recognize the Azure umbrella slug "savingsplans" for the "All Savings Plans" tri-state service filter, overlapping with this PR's core logic updates.

Suggested labels

impact/many

Poem

🐰 Azure Savings Plans hop into the view,
No hyphen needed, just "savingsplans" too,
Buckets collapse with labels so clean,
The finest Savings Plans we've ever seen! ✨

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title accurately reflects the main changes: adding frontend support for Azure Savings Plans rows and column visibility in the recommendations table.
Linked Issues check	✅ Passed	The pull request fully implements the scope of issue #658: Azure Savings Plans rows are rendered with column visibility handling mirroring AWS Savings Plans behavior.
Out of Scope Changes check	✅ Passed	All changes are directly scoped to issue #658 requirements: extending service slug recognition and bucket label handling to support Azure Savings Plans in frontend rendering.
Docstring Coverage	✅ Passed	Docstring coverage is 100.00% which is sufficient. The required threshold is 80.00%.

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• Create PR with unit tests
• Commit unit tests in branch feat/658-azure-sp-rows-frontend

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