feat: export Invoices page as a component and consume it in apps/admin

[paanSinghCoder]

• Move Invoices page to @raystack/frontier/admin
• Moved Invoices UI from apps/admin/src/pages/invoices/list/ into web/lib/admin/views/invoices/ as a router-agnostic page.
• Exported InvoicesPage from @raystack/frontier/admin with optional prop: appName.
• Reused lib/admin shared pieces: utils (connect-pagination, transform-query, connect-timestamp with isNullTimestamp), components (PageTitle, etc.) and CSS modules.
• Wired the admin app via InvoicesPageWithRouter and route invoices.
• Removed pages/invoices/list from the app; Invoices is implemented in the lib.
• Exported shared pagination/query utils from the lib so existing app pages (org list/details, users list, audit logs, etc.) import them from @raystack/frontier/admin instead of ~/utils/....

Note: For local testing, use "@raystack/frontier": "workspace:^" in frontier/web/apps/admin/package.json.
Technical details

• Page: lib/admin/views/invoices/ (index, columns, navbar, invoices.module.css).
• Utils: connect-pagination, transform-query; connect-timestamp extended with isNullTimestamp for columns.
• App: InvoicesPageWithRouter in apps/admin/src/pages/invoices/, route /invoices; Sidebar uses ~/assets/icons/invoices.svg.

Test plan

• Manual testing completed.
• Build and type checking pass.

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Project	Deployment	Actions	Updated (UTC)
frontier	Ready	Preview, Comment	Feb 16, 2026 6:25am

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Pull Request Test Coverage Report for Build 22052380291

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Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 38.24%

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Totals
Change from base Build 22052012704:	0.0%
Covered Lines:	16107
Relevant Lines:	42121

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💛 - Coveralls

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