Enable Linear app mentions and delegation

[daniel-lxs]

Summary

• request Linear's app mention and issue-delegation scopes for deployment installations
• give administrators a generic Reconnect action for any connected Linear workspace
• keep user-linked Linear accounts read-only

Validation

• focused OAuth, integration UI, and Linear command tests (68 tests)
• @roomote/types OAuth scope tests (2 tests)
• @roomote/types typecheck
• @roomote/web typecheck
• ESLint, formatting, and diff checks

[roomote-roomote]

No new code issues found. See task

• apps/web/src/trpc/commands/linear/index.ts:45 Preserve the previously granted scopes when a token refresh response omits scope; otherwise storeTokens replaces them with [], so an installation that already has the new permissions is incorrectly marked as needing reconnect after its first refresh.

_{Reviewed de7276e}