fix: prevent stale loader and action results during route transitions

[Varixo]

• Prevented stale loader and action responses from overwriting newer results or triggering outdated redirects
• Preserved shared loader signals and disposed loaders belonging to departed routes
• Fixed overlapping navigation, cancellation, and restoration of committed loader state
• Corrected loader metadata for nested routes, named layouts, layout stops, and rewrites
• Fixed computed cleanup with concurrent jobs, preventing missed cleanup and late updates after disposal
• Preserved encoded parameters in rewritten loader URLs
• Simplified action submission tracking to a local object shared by the submit QRL

[changeset-bot]

🦋 Changeset detected

Latest commit: 3b7b79e

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 7 packages

Name	Type
@qwik.dev/router	Patch
@qwik.dev/core	Patch
eslint-plugin-qwik	Patch
@qwik.dev/devtools	Patch
@qwik.dev/react	Patch
@qwik.dev/utils	Patch
create-qwik	Patch

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commit: 3b7b79e

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