fix: remove export const revalidate from all 17 pages

Remove time-based ISR revalidation from all pages and sitemap.
These caused constant ISR writes on every visitor request:
- revalidate=60 on 7 listing pages (writes every minute per visitor)
- revalidate=3600 on 5 detail pages
- revalidate=86400 on 4 static pages
- revalidate=3600 on sitemap.ts

With defineLive + SanityLive handling real-time updates, time-based
ISR revalidation provides zero benefit while consuming ISR writes.

Files modified:
- app/(main)/page.tsx
- app/(main)/(post)/post/[slug]/page.tsx
- app/(main)/(post)/blog/page.tsx
- app/(main)/(post)/blog/page/[num]/page.tsx
- app/(main)/(podcast)/podcast/[slug]/page.tsx
- app/(main)/(podcast)/podcasts/page.tsx
- app/(main)/(podcast)/podcasts/page/[num]/page.tsx
- app/(main)/(author)/author/[slug]/page.tsx
- app/(main)/(author)/authors/page/[num]/page.tsx
- app/(main)/(guest)/guest/[slug]/page.tsx
- app/(main)/(guest)/guests/page/[num]/page.tsx
- app/(main)/(sponsor)/sponsor/[slug]/page.tsx
- app/(main)/(sponsor)/sponsors/page/[num]/page.tsx
- app/(main)/(top-level-pages)/[slug]/page.tsx
- app/(main)/(top-level-pages)/pro/page.tsx
- app/(main)/(top-level-pages)/sponsorships/page.tsx
- app/sitemap.ts

Co-authored-by: research <research@miriad.systems>

Author: Miriad

app/(main)/(author)/author/[slug]/page.tsx

@@ -19,7 +19,6 @@ import UserRelated from "@/components/user-related";
 
 type Params = Promise<{ slug: string }>;
 
-export const revalidate = 3600;
 
 export async function generateMetadata(
 	{ params }: { params: Params },

app/(main)/(author)/authors/page/[num]/page.tsx

@@ -9,7 +9,6 @@ const LIMIT = 10;
 
 type Params = Promise<{ num: string }>;
 
-export const revalidate = 60;
 
 export async function generateStaticParams() {
 	const count = await client.fetch<number>(

app/(main)/(guest)/guest/[slug]/page.tsx

@@ -20,7 +20,6 @@ import Avatar from "@/components/avatar";
 
 type Params = Promise<{ slug: string }>;
 
-export const revalidate = 3600;
 
 export async function generateMetadata(
 	{ params }: { params: Params },

app/(main)/(guest)/guests/page/[num]/page.tsx

@@ -9,7 +9,6 @@ const LIMIT = 10;
 
 type Params = Promise<{ num: string }>;
 
-export const revalidate = 60;
 
 export async function generateStaticParams() {
 	const count = await client.fetch<number>(

app/(main)/(podcast)/podcast/[slug]/page.tsx

@@ -8,7 +8,6 @@ import Podcast from "../Podcast";
 
 type Params = Promise<{ slug: string }>;
 
-export const revalidate = 3600;
 
 export async function generateMetadata(
 	{ params }: { params: Params },

app/(main)/(podcast)/podcasts/page.tsx

@@ -16,7 +16,6 @@ import MoreHeader from "@/components/more-header";
 
 import PodmatchBadge from "@/components/podmatch-badge";
 
-export const revalidate = 60;
 function HeroPodcast({
 	title,
 	slug,

app/(main)/(podcast)/podcasts/page/[num]/page.tsx

@@ -9,7 +9,6 @@ const LIMIT = 10;
 
 type Params = Promise<{ num: string }>;
 
-export const revalidate = 60;
 
 export async function generateStaticParams() {
 	const count = await client.fetch<number>(

app/(main)/(post)/blog/page.tsx

@@ -15,7 +15,6 @@ import { Separator } from "@/components/ui/separator";
 
 import MoreHeader from "@/components/more-header";
 
-export const revalidate = 60;
 function HeroPost({
 	title,
 	slug,

app/(main)/(post)/blog/page/[num]/page.tsx

@@ -9,7 +9,6 @@ const LIMIT = 10;
 
 type Params = Promise<{ num: string }>;
 
-export const revalidate = 60;
 
 export async function generateStaticParams() {
 	const count = await client.fetch<number>(

app/(main)/(post)/post/[slug]/page.tsx

@@ -19,7 +19,6 @@ import SponsorCard from "@/components/sponsor-card";
 
 type Params = Promise<{ slug: string }>;
 
-export const revalidate = 3600;
 
 export async function generateMetadata(
 	{ params }: { params: Params },