feat: [TBB] Refactor quota usage menu and UI updates

[ethanyhou]

This PR updated Copilot usage status bar menu and menu bar menu.

• Switch cls to qingyiliu/token-based-billing
• Test using test accounts and adjust the quota usage using the old quota setup portal (It is working now and the usage menu should be refreshed in the real time as long as CAPI notifies the quota changes) :

Plan	Account	UI (status bar menu should be identical to the menu bar menu)
Max	eclipse-proplus
Pro+	xcode-proplus
Pro	xcode-pro
Free	xcode-test
CB	eclipse-cb
CB	xcode-cb
CE	MS account

CFI users should see AI Credits and CBCE users should see Monthly Limit if the plan is not unlimited.

---

Also added code to fallback to the original UI before TBB relase

Component	Before TBB	After TBB
Model selector
Chat footer
Usage menu

[Copilot]

Pull request overview

This PR refactors the Copilot “Usage” menu (status bar + menu bar) to support updated quota semantics and plan types (including Individual Max), adds shared menu helpers, and modernizes the quota protocol types to Java records.

Changes:

• Introduces MenuUtils to centralize plan labeling, usage icon selection, overage/upgrade row logic, and allowance-reset formatting.
• Updates status-bar and menu-bar handlers + QuotaTextCalculator to render the new usage UI (monthly limit/included credits, overage upsell, allowance reset row).
• Refactors quota protocol DTOs (Quota, CheckQuotaResult) to records, adds resetDateUtc, and adds CheckQuotaResult.empty() as the default placeholder.

Reviewed changes

Copilot reviewed 14 out of 14 changed files in this pull request and generated 5 comments.

Show a summary per file

File	Description
com.microsoft.copilot.eclipse.ui/src/com/microsoft/copilot/eclipse/ui/utils/MenuUtils.java	New shared helpers for usage menu rendering (plan labels, icons, allowance reset, predicates).
com.microsoft.copilot.eclipse.ui/src/com/microsoft/copilot/eclipse/ui/i18n/messages.properties	Adds/updates localized strings for the refactored usage UI.
com.microsoft.copilot.eclipse.ui/src/com/microsoft/copilot/eclipse/ui/i18n/Messages.java	Declares new NLS fields for the updated usage UI strings.
com.microsoft.copilot.eclipse.ui/src/com/microsoft/copilot/eclipse/ui/handlers/ShowStatusBarMenuHandler.java	Refactors status-bar menu construction and refresh to use MenuUtils + new quota display rules.
com.microsoft.copilot.eclipse.ui/src/com/microsoft/copilot/eclipse/ui/handlers/ShowMenuBarMenuHandler.java	Refactors menu-bar contribution items to match the new usage UI and refresh behavior.
com.microsoft.copilot.eclipse.ui/src/com/microsoft/copilot/eclipse/ui/handlers/QuotaTextCalculator.java	Updates quota row text formatting (included credits vs monthly limit, percent formatting, tooltips).
com.microsoft.copilot.eclipse.ui/src/com/microsoft/copilot/eclipse/ui/chat/services/ModelService.java	Updates plan accessor usage after CheckQuotaResult refactor.
com.microsoft.copilot.eclipse.ui/src/com/microsoft/copilot/eclipse/ui/chat/ChatContentViewer.java	Updates plan accessor usage and reuses CFI plan predicate.
com.microsoft.copilot.eclipse.core/src/com/microsoft/copilot/eclipse/core/lsp/protocol/quota/QuotaSnapshotParams.java	Adds record type for quota snapshots used in quota change/warning notifications.
com.microsoft.copilot.eclipse.core/src/com/microsoft/copilot/eclipse/core/lsp/protocol/quota/Quota.java	Refactors quota DTO to a record with clamped percentRemaining and equality excluding timestamp.
com.microsoft.copilot.eclipse.core/src/com/microsoft/copilot/eclipse/core/lsp/protocol/quota/CopilotPlan.java	Adds individual_max plan value.
com.microsoft.copilot.eclipse.core/src/com/microsoft/copilot/eclipse/core/lsp/protocol/quota/CheckQuotaResult.java	Refactors to a record, adds resetDateUtc + token-based billing flag, and empty() placeholder.
com.microsoft.copilot.eclipse.core/src/com/microsoft/copilot/eclipse/core/AuthStatusManager.java	Uses CheckQuotaResult.empty() as the default quota status.
com.microsoft.copilot.eclipse.core.test/src/com/microsoft/copilot/eclipse/core/AuthStatusManagerTests.java	Updates tests to use CheckQuotaResult.empty() instead of new CheckQuotaResult().

[ethanyhou]

Hi @jdneo,

As we aligned, append TBB fallback to the same PR via commit: 2bac11b