chore: remove overzealous destructuring (#6930)

<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->
## Summary by CodeRabbit

- New Features
  - None

- Documentation
- Revised coding guidelines: nuanced destructuring rules and
front-matter now include .md/.mdx.
  - Unified resolver/middleware examples to use a single opts parameter.
  - Blog example: added tracing middleware and a span meta tag.
  - Fixed Next.js TypeScript docs link.

- Refactor
- Standardized example servers and code samples to opts-based callbacks
without behavior changes.

- Tests
  - Updated test suites to opts-based handlers; no behavioral changes.

- Chores
- Added rules enforcing pnpm usage and running tests without watch mode.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->

---------

Co-authored-by: autofix-ci[bot] <114827586+autofix-ci[bot]@users.noreply.github.com>
Co-authored-by: coderabbitai[bot] <136622811+coderabbitai[bot]@users.noreply.github.com>

Author: 3 people

src/server/routers/channel.ts

@@ -53,11 +53,11 @@ export const channelRouter = {
 
   create: authedProcedure
     .input(z.object({ name: z.string().trim().min(2) }))
-    .mutation(async ({ ctx, input }) => {
+    .mutation(async (opts) => {
       const [channel] = await db
         .insert(Channel)
         .values({
-          name: input.name,
+          name: opts.input.name,
         })
         .returning();