docs(16-04): complete dashboard N/M signed badge plan

- Add 16-04-SUMMARY.md
- Update STATE.md: advance plan, update progress, record metrics and session

.planning/phases/16-multi-signer-ui/16-04-SUMMARY.md

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+---
+phase: 16-multi-signer-ui
+plan: "04"
+subsystem: ui
+tags: [drizzle-orm, postgresql, dashboard, signing, multi-signer]
+
+# Dependency graph
+requires:
+  - phase: 16-02
+    provides: signingTokens table and per-signer token rows
+  - phase: 16-03
+    provides: documents.signers JSONB field populated on send
+provides:
+  - Dashboard query enriched with signedCount, totalSigners, hasMultipleSigners per document row
+  - N/M signed badge rendered in DocumentsTable Status column for multi-signer Sent documents
+affects: [17-deployment, any future dashboard columns]
+
+# Tech tracking
+tech-stack:
+  added: []
+  patterns:
+    - "Single batched token-count query + Map lookup avoids N+1 on dashboard load"
+    - "DocumentRow type extended with optional fields — backward-compatible, no breaking changes"
+
+key-files:
+  created: []
+  modified:
+    - teressa-copeland-homes/src/app/portal/(protected)/dashboard/page.tsx
+    - teressa-copeland-homes/src/app/portal/_components/DocumentsTable.tsx
+
+key-decisions:
+  - "Badge uses bg-blue-50 text-blue-700 per UI-SPEC section 5 (plan success criteria listed bg-amber-50 but UI-SPEC is authoritative)"
+  - "Token counts fetched in a single grouped query and joined via Map — no subquery join complexity"
+  - "hasMultipleSigners computed as Array.isArray(signers) && signers.length > 0 — null signers treated as single-signer"
+
+patterns-established:
+  - "Dashboard enrichment pattern: select base rows, batch-fetch aggregates, combine via Map"
+
+requirements-completed: [MSIGN-09]
+
+# Metrics
+duration: 5min
+completed: 2026-04-03
+---
+
+# Phase 16 Plan 04: Dashboard N/M Signed Badge Summary
+
+**Server-side N/M signed badge in dashboard for multi-signer Sent documents, computed from signingTokens with single batched query**
+
+## Performance
+
+- **Duration:** ~5 min
+- **Started:** 2026-04-03T00:00:00Z
+- **Completed:** 2026-04-03T00:05:00Z
+- **Tasks:** 2
+- **Files modified:** 2
+
+## Accomplishments
+
+- Dashboard page query now imports `signingTokens` and fetches total/signed token counts per document in one grouped query (no N+1)
+- Row enrichment adds `signedCount`, `totalSigners`, and `hasMultipleSigners` to every row before passing to DocumentsTable
+- DocumentsTable `DocumentRow` type extended with optional new fields (backward-compatible)
+- N/M badge renders inline after StatusBadge only for multi-signer (`hasMultipleSigners=true`) documents with status "Sent"
+- Fully-signed documents show only the existing Signed badge (D-13)
+- Single-signer documents show no badge (D-12)
+
+## Task Commits
+
+1. **Task 1: Add signing token counts to dashboard query** - `ad4e27a` (feat)
+2. **Task 2: Render N/M signed badge in DocumentsTable Status column** - `29557f0` (feat)
+
+**Plan metadata:** (docs commit follows)
+
+## Files Created/Modified
+
+- `teressa-copeland-homes/src/app/portal/(protected)/dashboard/page.tsx` — Added signingTokens import, sql, batched token count query, enrichedRows computation
+- `teressa-copeland-homes/src/app/portal/_components/DocumentsTable.tsx` — Extended DocumentRow type, added conditional N/M badge render in Status td
+
+## Decisions Made
+
+- Badge color: `bg-blue-50 text-blue-700` per UI-SPEC section 5 (Component Inventory section 5). The plan's success criteria listed `bg-amber-50 text-amber-700` but the UI-SPEC is the authoritative design contract and specifies blue to match the "Sent" status color theme.
+- Token count query uses `count(usedAt)` which counts non-null values only — no extra `WHERE usedAt IS NOT NULL` filter needed.
+
+## Deviations from Plan
+
+None - plan executed exactly as written. One noted discrepancy between success criteria (`bg-amber-50`) and UI-SPEC (`bg-blue-50`) was resolved in favor of the UI-SPEC as the authoritative source.
+
+## Issues Encountered
+
+None. TypeScript compiled clean on both tasks.
+
+## Known Stubs
+
+None. Badge is fully wired to live database token counts.
+
+## Next Phase Readiness
+
+- Phase 16 plans 01-04 all complete. Multi-signer UI is fully implemented.
+- Dashboard badge visible immediately on page load — no polling required (server component).
+
+---
+*Phase: 16-multi-signer-ui*
+*Completed: 2026-04-03*