feat: shareable workspaces MVP (frontend)

[alex-mcgovern]

• Handles breaking changes introduced in the API to enable shareable workspaces
• Adds a "download" / "upload" functionality to workspaces in the dashboard

[coveralls]

Pull Request Test Coverage Report for Build 13897242479

Details

• 36 of 72 (50.0%) changed or added relevant lines in 14 files are covered.
• 3 unchanged lines in 2 files lost coverage.
• Overall coverage decreased (-0.2%) to 66.303%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
src/features/providers/components/table-providers.tsx	0	1	0.0%
src/features/providers/hooks/use-confirm-delete-provider.tsx	0	1	0.0%
src/features/workspace/components/workspace-muxing-model.tsx	4	5	80.0%
src/features/workspace/lib/mux-model-serde.ts	4	5	80.0%
src/mocks/msw/handlers.ts	1	2	50.0%
src/features/providers/hooks/use-query-workspaces-by-provider.ts	0	2	0.0%
src/routes/route-provider-update.tsx	0	5	0.0%
src/features/workspace/components/workspace-download-button.tsx	3	14	21.43%
src/features/workspace/components/workspace-upload-button.tsx	3	16	18.75%

Files with Coverage Reduction	New Missed Lines	%
src/features/providers/hooks/use-confirm-delete-provider.tsx	1	0.0%
src/features/dashboard-messages/components/conversation-secrets-detected.tsx	2	0.0%

Totals
Change from base Build 13896570679:	-0.2%
Covered Lines:	911
Relevant Lines:	1311

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💛 - Coveralls

[lukehinds]

@davolokh can you help with reviewing

[alex-mcgovern]

These are just UX enhancements that make deleting using the UI more ergonomic, it became apparent these were needed when creating/deleting repeatedly during manual testing.