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fix(pages): report page route clashes and match encoded page paths #2339

Job	Run time
build and typecheck (ubuntu-latest)	1m 24s
test (ubuntu-latest, unit)	2m 19s
test (ubuntu-latest, 2/2)	1m 41s
test (ubuntu-latest, 1/2)	2m 28s
live-e2e	0s
done	2s
	7m 54s