Rename variables in LayoutRouter for clarity

[acdlite]

LayoutRouter has changed significantly since it was originally written and the structure has become harder to follow. One thing I always find confusing whenever I'm reading this code is that some of the values correspond the the parent segment, while others correspond to the current segment. So this moves the code around a bit and updates the names so it's clearer which parts belong to which segments.

While working on this, I noticed a funny thing about how loading boundaries work that was made more obvious by the revised naming. I've left a TODO comment to follow up on whether this was intentional.

[ijjk]

Tests Passed

[ijjk]

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General

	vercel/next.js canary	acdlite/next.js refactor-layout-router	Change
buildDuration	23.6s	22s	N/A
buildDurationCached	20.7s	18.2s	N/A
nodeModulesSize	409 MB	409 MB	N/A
nextStartRea..uration (ms)	578ms	584ms	N/A

Client Bundles (main, webpack)

	vercel/next.js canary	acdlite/next.js refactor-layout-router	Change
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	vercel/next.js canary	acdlite/next.js refactor-layout-router	Change
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	vercel/next.js canary	acdlite/next.js refactor-layout-router	Change
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Middleware size

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build cache Overall increase ⚠️

	vercel/next.js canary	acdlite/next.js refactor-layout-router	Change
0.pack gzip	2.05 MB	2.05 MB	⚠️ +3.24 kB
index.pack gzip	72.1 kB	72.6 kB	⚠️ +535 B
Overall change	2.12 MB	2.13 MB	⚠️ +3.77 kB

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Commit: 9d7ab76