Combined single/multiplayer resources on play page

[kmck133]

Issue

Resources UI looked different between singleplayer and multiplayer, and the Notes button in multiplayer had no text label.

Solution

Both modes now use the same ResourcesPanel component and button. A "Notes" button styled identically sits next to "Resources" in multiplayer. Removed PlayPageSideButton, ResourcesModal, and the old flag-based resource fetching.

Risk

Multiplayer scenarios using the old flag-based Resource model will no longer show those resources. The panel now reads from the collections system only.

Checklist

• Acceptance criteria met
• Wiki documentation is written and up to date
• Unit tests written and passing
• Integration tests written and passing
• Continuous integration build passing

[linear]

VPS-73

[leowla]

Works well 👍

Will need to clean up backend's old model in a separate ticket (/api/resources/*, groupGetResources, resourcesDao, resource model)

We could also migrate old data if its not too much of a hassle.

[del-ereno]

neat works great