Add global asset_count to ApplicationStats and surface in home page StatsBar

[Copilot]

The global stats endpoint and home page lacked a total file count — only per-dandiset asset counts existed. This adds asset_count as a first-class field in ApplicationStats, computed alongside the existing size metric and exposed on the home page.

Backend

• Added asset_count = PositiveBigIntegerField(default=0) to ApplicationStats
• Added Asset.total_count() classmethod (mirrors total_size() pattern) — counts distinct assets belonging to at least one version
• Updated compute_application_stats task to populate it
• Migration 0031 adds the field and backfills existing rows

@classmethod
def total_count(cls):
    return cls.objects.filter(versions__isnull=False).distinct().count()

/api/stats/ now returns:

{ "dandiset_count": …, "published_dandiset_count": …, "user_count": …, "size": …, "asset_count": … }

Frontend

• StatsBar.vue adds files as a 4th global stat (dandisets / files / users / total size)
• Column widths adjusted from md=4 to md=3 to fit 4 stats per row

Tests

• test_stats_baseline updated to expect asset_count: 0
• New test_stats_asset_count verifies multiple assets are counted correctly
• test_stats_asset extended to assert asset_count == 1

Warning

Firewall rules blocked me from connecting to one or more addresses (expand for details)

I tried to connect to the following addresses, but was blocked by firewall rules:

• api.launchpad.net
  • Triggering command: /usr/bin/add-apt-repository add-apt-repository ppa:deadsnakes/ppa -y (dns block)
• astral.sh
  • Triggering command: /usr/bin/curl curl -LsSf REDACTED git conf�� it --global nfig/composer/ve/var/lib/dpkg/info/libxi6:amd64.list credential.usernid (dns block)
• releases.astral.sh
  • Triggering command: /home/REDACTED/.local/bin/uv uv python install 3.13 --force-confold --print-foreign-architectures --global ount-positions committer.name (dns block)

If you need me to access, download, or install something from one of these locations, you can either:

• Configure Actions setup steps to set up my environment, which run before the firewall is enabled
• Add the appropriate URLs or hosts to the custom allowlist in this repository's Copilot coding agent settings (admins only)

Original prompt

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This section details on the original issue you should resolve

<issue_title>Find better place for file size and file count</issue_title>
<issue_description>I understand the reason for moving these from where I had it in my designs, but I'd like to explore better options than where it's at now. I don't immediately know where that is, but I will provide some screens here when I figure it out.</issue_description>

<agent_instructions>See how done in dandi-cli and introduce reporting at least for backend but ideally for e2e as well</agent_instructions>

Comments on the Issue (you are @copilot in this section)

@waxlamp I agree with having you review the place where we moved it. As a starting point, can you say what's bad about the currently existing design? @jtomeck

Being multiline doesn't really work. It looks super busy and disjointed to me. Maybe it will work better as the dlp redesign continues, but it feels really off to me right now. I'd love opinions from the team to see if anyone disagrees with this, though!</comment_new>
<comment_new>@satra
some of it is the difference in different use cases: read view on mobile phones/tablets vs desktop view.. some of it may have to do with numbers of things.

it may be useful for us to do some realtime hacking with UI. </comment_new>

• Fixes Find better place for file size and file count #736

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[jjnesbitt]

So you asked copilot to come up with a fix for #736, and instead it added an asset count to the applicationstats model and home page? This change has nothing to do with #736.

[yarikoptic]

yeap, copilot ended up being useless for this one. Sorry for the noise