fix(eve): stabilize Teams continuation tokens

[iroiro147]

Summary

• normalize Teams channel-thread conversation ids carrying ;messageid=... before deriving continuation tokens
• prefer the parsed channel-thread root over volatile inbound replyToId for channel/group thread anchors
• ignore empty messageid suffixes so they cannot become thread roots

Refs #451.

Tests

• pnpm exec oxfmt --check packages/eve/src/public/channels/teams/api.ts packages/eve/src/public/channels/teams/api.test.ts packages/eve/src/public/channels/teams/inbound.ts packages/eve/src/public/channels/teams/inbound.test.ts packages/eve/src/public/channels/teams/teamsChannel.test.ts .changeset/teams-stable-continuation.md
• pnpm --filter eve exec oxlint src/public/channels/teams/api.ts src/public/channels/teams/api.test.ts src/public/channels/teams/inbound.ts src/public/channels/teams/inbound.test.ts src/public/channels/teams/teamsChannel.test.ts --deny-warnings
• pnpm --filter eve exec vitest run --config vitest.unit.config.ts src/public/channels/teams/api.test.ts src/public/channels/teams/inbound.test.ts src/public/channels/teams/teamsChannel.test.ts
• pnpm --filter eve run typecheck
• pnpm changeset status --since origin/main
• pnpm guard:invariants
• git diff --check && git diff --cached --check

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