[cna] upgrade templates tailwind to v4

[devjiwonchoi]

Since Tailwind v4 was released, update the create-next-app templates.
This PR made change of following process:

1. Remove tailwind config.
2. Update the globals.css file.
3. Add --geist- font CSS variable to the globals.css file.
4. Change postcss dependency to @tailwindcss/postcss.
5. Update postcss config.
6. Update tests.

Note: Removed the types for postcss added at #63380 since it requires additional postcss-load-config dependency.

[devjiwonchoi]

• [cna] upgrade templates tailwind to v4 #75407 👈 (View in Graphite)
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[ijjk]

Tests Passed

[ijjk]

Stats from current PR

Default Build

General

	vercel/next.js canary	vercel/next.js _cna_upgrade_tailwind_to_v4	Change
buildDuration	17.5s	15.8s	N/A
buildDurationCached	14.9s	12.4s	N/A
nodeModulesSize	392 MB	392 MB	✓
nextStartRea..uration (ms)	427ms	427ms	✓

Client Bundles (main, webpack)

	vercel/next.js canary	vercel/next.js _cna_upgrade_tailwind_to_v4	Change
5306-HASH.js gzip	54 kB	53.9 kB	N/A
8276.HASH.js gzip	169 B	168 B	N/A
8377-HASH.js gzip	5.46 kB	5.46 kB	N/A
bccd1874-HASH.js gzip	52.9 kB	52.9 kB	✓
framework-HASH.js gzip	57.5 kB	57.5 kB	N/A
main-app-HASH.js gzip	240 B	242 B	N/A
main-HASH.js gzip	34.5 kB	34.4 kB	N/A
webpack-HASH.js gzip	1.71 kB	1.71 kB	N/A
Overall change	52.9 kB	52.9 kB	✓

Legacy Client Bundles (polyfills)

	vercel/next.js canary	vercel/next.js _cna_upgrade_tailwind_to_v4	Change
polyfills-HASH.js gzip	39.4 kB	39.4 kB	✓
Overall change	39.4 kB	39.4 kB	✓

Client Pages

	vercel/next.js canary	vercel/next.js _cna_upgrade_tailwind_to_v4	Change
_app-HASH.js gzip	193 B	193 B	✓
_error-HASH.js gzip	193 B	193 B	✓
amp-HASH.js gzip	512 B	510 B	N/A
css-HASH.js gzip	343 B	342 B	N/A
dynamic-HASH.js gzip	1.84 kB	1.84 kB	✓
edge-ssr-HASH.js gzip	265 B	265 B	✓
head-HASH.js gzip	363 B	362 B	N/A
hooks-HASH.js gzip	393 B	392 B	N/A
image-HASH.js gzip	4.59 kB	4.58 kB	N/A
index-HASH.js gzip	268 B	268 B	✓
link-HASH.js gzip	2.35 kB	2.35 kB	N/A
routerDirect..HASH.js gzip	328 B	328 B	✓
script-HASH.js gzip	397 B	397 B	✓
withRouter-HASH.js gzip	323 B	326 B	N/A
1afbb74e6ecf..834.css gzip	106 B	106 B	✓
Overall change	3.59 kB	3.59 kB	✓

Client Build Manifests

	vercel/next.js canary	vercel/next.js _cna_upgrade_tailwind_to_v4	Change
_buildManifest.js gzip	748 B	747 B	N/A
Overall change	0 B	0 B	✓

Rendered Page Sizes

	vercel/next.js canary	vercel/next.js _cna_upgrade_tailwind_to_v4	Change
index.html gzip	524 B	523 B	N/A
link.html gzip	539 B	537 B	N/A
withRouter.html gzip	520 B	520 B	✓
Overall change	520 B	520 B	✓

Edge SSR bundle Size

	vercel/next.js canary	vercel/next.js _cna_upgrade_tailwind_to_v4	Change
edge-ssr.js gzip	129 kB	129 kB	N/A
page.js gzip	210 kB	210 kB	N/A
Overall change	0 B	0 B	✓

Middleware size

	vercel/next.js canary	vercel/next.js _cna_upgrade_tailwind_to_v4	Change
middleware-b..fest.js gzip	670 B	665 B	N/A
middleware-r..fest.js gzip	155 B	156 B	N/A
middleware.js gzip	31.3 kB	31.3 kB	N/A
edge-runtime..pack.js gzip	844 B	844 B	✓
Overall change	844 B	844 B	✓

Next Runtimes

	vercel/next.js canary	vercel/next.js _cna_upgrade_tailwind_to_v4	Change
app-page-exp...dev.js gzip	386 kB	386 kB	N/A
app-page-exp..prod.js gzip	131 kB	131 kB	✓
app-page-tur..prod.js gzip	144 kB	144 kB	✓
app-page-tur..prod.js gzip	140 kB	140 kB	✓
app-page.run...dev.js gzip	373 kB	373 kB	N/A
app-page.run..prod.js gzip	128 kB	128 kB	✓
app-route-ex...dev.js gzip	39.4 kB	39.4 kB	✓
app-route-ex..prod.js gzip	25 kB	25 kB	✓
app-route-tu..prod.js gzip	25 kB	25 kB	✓
app-route-tu..prod.js gzip	24.8 kB	24.8 kB	✓
app-route.ru...dev.js gzip	41 kB	41 kB	✓
app-route.ru..prod.js gzip	24.8 kB	24.8 kB	✓
dist_client_...dev.js gzip	326 B	326 B	✓
dist_client_...dev.js gzip	318 B	318 B	✓
pages-api-tu..prod.js gzip	8.81 kB	8.81 kB	✓
pages-api.ru...dev.js gzip	11.5 kB	11.5 kB	✓
pages-api.ru..prod.js gzip	8.8 kB	8.8 kB	✓
pages-turbo...prod.js gzip	21.6 kB	21.6 kB	✓
pages.runtim...dev.js gzip	31.3 kB	31.3 kB	N/A
pages.runtim..prod.js gzip	21.6 kB	21.6 kB	✓
server.runti..prod.js gzip	73.7 kB	73.7 kB	✓
Overall change	870 kB	870 kB	✓

build cache

	vercel/next.js canary	vercel/next.js _cna_upgrade_tailwind_to_v4	Change
0.pack gzip	2.1 MB	2.1 MB	N/A
index.pack gzip	74.9 kB	75 kB	N/A
Overall change	0 B	0 B	✓

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Commit: 6855f11