Fix duplicate upload + add scroll remembering

[ildyria]

• improve code style on ref()
• use boolean globally defined in a store state for the most important modals (new album, upload)

See in particular:
https://github.com/LycheeOrg/Lychee/pull/2693/files#diff-5585be2db0c41adcd345e27400e1476598e1979d611d3030d032d049f64f12e4
https://github.com/LycheeOrg/Lychee/pull/2693/files#diff-4fdc99a20d4bdd62b978a193d29a30934d64bf6ceb26f010bd441b9e9ac167db
TODO later: migrate the other booleans (rename etc) to that store.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 84.72%. Comparing base (15c8908) to head (6fc9b9c).
Report is 3 commits behind head on master.

Additional details and impacted files

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[tinohager]

the code is duplicate props.config.value === "1", maybe you could save the result above in a const

[ildyria]

But a const would not be updated on a save of the value as done with the watch :/

[tinohager]

computed?

[tinohager]

When does the pull-request flow into the alpha version of the docker container?

[ildyria]

@tinohager about tonight it will be available on nightly/dev and alpha. :)