fix(build): filter Pages-owned RSC warm paths

[james-elicx]

Summary

• resolve each concrete App-discovered warm path through the same cross-router ownership decision used at runtime
• exclude Pages page and Pages API-owned collisions only from full/loading-shell RSC warm targets
• retain generic HTML warm discovery so the deployed Worker still decides response cacheability
• compare against the best concrete App match, preserving more-specific App routes over broad Pages matches

This remains independent of local prerender output and the prerender flag.

Next.js references

• test/e2e/app-dir/use-params/use-params.test.ts
• test/e2e/app-dir/pages-to-app-routing/pages-to-app-routing.test.ts
• packages/next/src/server/base-server.ts

Testing

• vp test run tests/prerender-paths.test.ts tests/hybrid-route-priority.test.ts (28 passed)
• vp check packages/vinext/src/build/prerender-paths.ts tests/prerender-paths.test.ts

Stacked on #3022.

[pkg-pr-new]

Open in StackBlitz

npm i https://pkg.pr.new/@vinext/cloudflare@3023

npm i https://pkg.pr.new/create-vinext-app@3023

npm i https://pkg.pr.new/@vinext/types@3023

npm i https://pkg.pr.new/vinext@3023

commit: 4035031

[github-actions]

Example	Preview	Production	Original
app-router-cloudflare	preview	production
pages-router-cloudflare	preview	production
app-router-playground	preview	production	original
realworld-api-rest	preview	production
nextra-docs-template	preview	production
benchmarks	preview	production
hackernews	preview	production	original
workers-cache	preview	production
web	preview	production

[github-actions]

Performance benchmarks

Compared 4035031 against base 48cd8b7 using alternating same-runner rounds. Next.js was unchanged and skipped.

0 improved · 0 regressed · 6 within ±1.5%

Scenario	Framework	Baseline	Current	Change
Client bundle size (gzip)	vinext	142.0 KB	142.0 KB	⚫ -0.0%
Client entry size (gzip)	vinext	129.3 KB	129.3 KB	⚫ -0.0%
Dev server cold start	vinext	3.04 s	3.02 s	⚫ -0.6%
Production build time	vinext	3.30 s	3.28 s	⚫ -0.6%
RSC entry closure size (gzip)	vinext	116.0 KB	116.0 KB	⚫ +0.0%
Server bundle size (gzip)	vinext	197.5 KB	197.5 KB	⚫ +0.0%

View detailed results and traces

_{🟢 improvement · 🔴 regression · ⚫ change below 1.5% · paired base/head}

[james-elicx]

Superseded by consolidated PR #3040. No commits were dropped or rewritten: #3040 now contains this exact linear commit as part of #3021–#3040. Closing only the redundant draft PR.