fix(ci): flox upgrade to resolve nodejs package conflict

[garbas]

Problem

The Lighthouse CI is failing for every PR (including #42) at the Activate Flox environment step:

❌ ERROR: 'nodejs' conflicts with 'nodejs'.
Both packages provide the file 'include/node/common.gypi'

The manifest installs nodejs explicitly and clean-css-cli (which bundles its own nodejs). Both resolved at priority 5 and collide, so the environment fails to build. This is broken on main, which means the CI's base-branch comparison step also fails — no PR can go green until main is fixed.

Fix

Ran flox upgrade, which re-locks the environment and resolves the conflict. It also bumps a few packages:

• google-lighthouse 12.8.2 -> 13.3.0
• nodejs 22.21.1 -> 24.15.0
• just 1.43.1 -> 1.51.0
• imagemagick 7.1.2-8 -> 7.1.2-23

Verification

Locally, flox activate now builds successfully and node, lighthouse, just and cleancss all resolve (node v24.15.0, lighthouse 13.3.0).

Only .flox/env/manifest.{toml,lock} change — no site content touched.

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[garbas]

Superseded — folding the Flox env fix into #42 (per request to keep it in one PR). #42 also patches the Lighthouse workflow to measure the base branch with the PR's fixed Flox env, so it no longer depends on main being fixed first.