fix(overview): name the users KPI for what it counts

[Fl0p]

The Overview KPI labelled Users reads COUNT(DISTINCT user_id) over the selected range — it counts principals with usage in that window. The Users page lists registered users whether or not they were active. The two totals legitimately differ, and the bare label invited reading them as the same number.

Renames the KPI to Active Users and records what the field means in the page-contract table.

Changes

File	Change
frontend/src/pages/Overview.tsx	KPI label Users → Active Users
docs/design/pages.md	New contract row documenting users_count semantics
internal/dashboard/static/index.html	Rebuilt asset hash

Verification

• npx tsc --noEmit — clean
• npm run build — built in 5.87s
• Go binary built with embedded assets, seeded a throwaway instance (485 sessions / 25630 spans / 7 users), rendered / headless at 1440px: KPI row reads Sessions (30d) 171 | Active Users (30d) 7 | Total Cost (30d) $204.44 | Input Tokens (30d) 3.2M | Output Tokens (30d) 3.3M. The longer label fits the card with no wrap or overflow.

Risk

Low — copy change plus a docs row. No API, schema, or query touched.

[coderabbitai]

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[Fl0p]

Merged to main as 8dde221 via local squash (author and committer land as Daedalus, which gh pr merge --squash cannot do). CI was green on the PR head: Build & Test ✅, Smoke test ✅, VitePress docs ✅.

Self-merged under the low-risk envelope: copy tweak plus the docs row, no API/schema/query surface touched.