Encourage coarser mags when annotating a high number of voxels

[knollengewaechs]

URL of deployed dev instance (used for testing):

• https://encouragecoarsermagsforlargevolumeannotations.webknossos.xyz/

Steps to test:

• Open an annotation with multiple mags
• Zoom out for a coarse mag
• Brush anything using a big brush. You will need to change about 1000 buckets within 60s.
• the warning toast should appear
• Try clicking the toast away (without setting the "never show again")
• try clicking "never show again". It should be supressed now.

TODOs:

• user is able to click this away in one sesstion and forever
• bucket threshold is in application.conf
• share dev deplayment and ask for feedback, e.g. for threshold and false positives
• remove magic numbers
• find good place to store value of "dont show this again" -> dont show again for relation annotation&user? or only user? consider how annotation&user specific values are stores in live-is-live

Issues:

• fixes Enforce/encourage coarser mags when annotating large volumes #8566

feedback:

https://scm.slack.com/archives/C5AKLAV0B/p1760367097181289

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(Please delete unneeded items, merge only when none are left open)

• Added changelog entry (create a $PR_NUMBER.md file in unreleased_changes or use ./tools/create-changelog-entry.py)
• Added migration guide entry if applicable (edit the same file as for the changelog)
• Updated documentation if applicable
• Adapted wk-libs python client if relevant API parts change
• Removed dev-only changes like prints and application.conf edits
• Considered common edge cases
• Needs datastore update after deployment

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✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch encourage-coarser-mags-for-large-volume-annotations

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[knollengewaechs]

remove dev change