refactor: extract duplicated patterns into shared helpers

[nathanialhenniges]

Summary

• Created 4 shared helper utilities (safeErrorReply, requireOwner, sendToMainChannel, updateGuildPremiumStatus) to replace copy-pasted patterns
• Updated 28 source files to use the new helpers, removing ~200 lines of duplicated code
• All 228 tests pass, typecheck clean, lint clean

Test plan

• bun run typecheck passes
• bun test — 228 tests, 0 failures
• bun run lint passes

🤖 Generated with Claude Code

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: 9de40e24-1a80-47fc-8ace-5f662cc1dc6d

📥 Commits

Reviewing files that changed from the base of the PR and between b41a344 and 251584c.

📒 Files selected for processing (32)

• src/commands/about.ts
• src/commands/admin/activity/create.ts
• src/commands/admin/activity/list.ts
• src/commands/admin/activity/remove.ts
• src/commands/admin/index.ts
• src/commands/admin/quote/create.ts
• src/commands/admin/quote/list.ts
• src/commands/admin/quote/remove.ts
• src/commands/admin/suggestion/approve.ts
• src/commands/admin/suggestion/list.ts
• src/commands/admin/suggestion/reject.ts
• src/commands/admin/suggestion/stats.ts
• src/commands/changelog.ts
• src/commands/help.ts
• src/commands/invite.ts
• src/commands/owner/index.ts
• src/commands/owner/premium/testCreate.ts
• src/commands/owner/premium/testDelete.ts
• src/commands/owner/premium/testList.ts
• src/commands/premium.ts
• src/commands/quote.ts
• src/commands/setup/channel.ts
• src/commands/setup/index.ts
• src/commands/setup/schedule.ts
• src/commands/suggestion.ts
• src/events/entitlementCreate.ts
• src/events/entitlementDelete.ts
• src/events/entitlementUpdate.ts
• src/utils/commandErrors.ts
• src/utils/entitlementHelpers.ts
• src/utils/mainChannel.ts
• src/utils/ownerGuard.ts

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch FLUFF-refactor-extract-helpers

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