fix(routing): prefix roots should point to root

[wmertens]

fixes #8504

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Latest commit: 28e9723

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[Copilot]

Pull request overview

Fixes a regression in rewriteRoutes (v2 beta) where a prefixed locale root (e.g. /en/) no longer rewrote to the app root route, by treating an empty-string _G rewrite target as a valid rewrite.

Changes:

• Update runtime routing logic to treat _G: "" as present (nullish checks instead of truthiness checks).
• Update build-time trie serialization to emit _G even when it’s an empty string.
• Add a unit test covering the “prefix root rewrites to index” scenario.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated no comments.

File	Description
packages/qwik-router/src/runtime/src/routing.unit.ts	Adds coverage ensuring _G: "" rewrites /en and /de to the root index.
packages/qwik-router/src/runtime/src/routing.ts	Fixes rewrite detection by using nullish checks so empty-string rewrites work.
packages/qwik-router/src/buildtime/runtime-generation/generate-routes.ts	Ensures _G is serialized into the generated trie even when _G === "".

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commit: 28e9723

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[Varixo]

LGTM