feat: add presences read and write scopes to API keys

[ArnabChatterjee20k]

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[greptile-apps]

Greptile Summary

This PR adds presences.read and presences.write to the API key scope definitions and updates the scopes component to fall back to locally-defined categories when the API returns a scope without one.

• Adds two new entries to constants.ts under a new 'Presences' category with the user-group icon.
• In scopes.svelte, builds a localByScope lookup map and uses fallback?.category to fill in the category when the API response omits it, ensuring presences scopes group correctly even before the server fully propagates the category field.

Confidence Score: 4/5

Safe to merge; changes are additive and isolated to the scope-selection UI.

Both changes are straightforward and additive. The constants addition is correct. The fallback logic in the component handles the case where the API omits a category, but the same fallback is not applied to the icon field despite one being available locally — a minor inconsistency with no immediate visible impact since icons are not rendered in this component's template.

No files require special attention.

Important Files Changed

Filename	Overview
src/lib/constants.ts	Adds presences.read and presences.write scope definitions with category 'Presences' and icon 'user-group', inserted between the Messaging and Other groups.
src/routes/(console)/project-[region]-[project]/overview/api-keys/scopes.svelte	Adds a local-scope fallback map so that when the API returns a scope without a category, the locally defined category is used instead; icon fallback is not applied consistently.

_{Reviews (1): Last reviewed commit: "feat: add presences read and write scope..." | Re-trigger Greptile}

[greptile-apps]

The fallback applies category from the local scope definition when the API omits it, but icon is still hardcoded to '' even though fallback?.icon is available. This creates an inconsistency: if the API returns a presences scope without its category, the grouping recovers correctly, but the icon stays blank rather than using the locally defined 'user-group' value.

Suggested change

	scopesById.set(scope.$id, {
	scope: scope.$id,
	description: scope.description,
	category: normalizeCategory(scope.category),
	category: normalizeCategory(scope.category || fallback?.category || ''),
	deprecated: scope.deprecated,
	icon: ''
	});
	scopesById.set(scope.$id, {
	scope: scope.$id,
	description: scope.description,
	category: normalizeCategory(scope.category || fallback?.category || ''),
	deprecated: scope.deprecated,
	icon: fallback?.icon ?? ''
	});