docs(11-03): complete device-site assignment UI plan

- SUMMARY.md with task commits, decisions, and metrics
- STATE.md updated: Phase 11 complete (3/3 plans)
- ROADMAP.md progress updated
- Requirements SITE-03, SITE-04, SITE-05 marked complete

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

.planning/phases/11-site-data-model-foundation/11-03-SUMMARY.md

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+---
+phase: 11-site-data-model-foundation
+plan: 03
+subsystem: ui, api
+tags: [react, tanstack-router, tanstack-query, tailwind, lucide, pydantic, sqlalchemy]
+
+# Dependency graph
+requires:
+  - phase: 11-site-data-model-foundation plan 01
+    provides: Sites CRUD API with device assignment endpoints
+  - phase: 11-site-data-model-foundation plan 02
+    provides: sitesApi frontend client and site routes
+provides:
+  - Site column in fleet table with clickable site name links
+  - Multi-select bulk assign devices to sites from fleet list
+  - Site selector dropdown on device detail page (assign/unassign)
+  - DeviceResponse includes site_id and site_name fields (backend + frontend)
+affects: [14-site-dashboard]
+
+# Tech tracking
+tech-stack:
+  added: []
+  patterns:
+    - "Bulk assign uses dialog with site select and mutation invalidation"
+    - "Multi-select checkboxes with Set<string> state and select-all toggle"
+
+key-files:
+  created: []
+  modified:
+    - backend/app/schemas/device.py
+    - backend/app/services/device.py
+    - frontend/src/lib/api.ts
+    - frontend/src/components/fleet/FleetTable.tsx
+    - frontend/src/routes/_authenticated/tenants/$tenantId/devices/$deviceId.tsx
+
+key-decisions:
+  - "Site column placed after Model column for logical grouping of device identity fields"
+  - "Viewers see site name as text, operators get a Select dropdown for assignment"
+
+patterns-established:
+  - "Multi-select pattern: checkbox column + Set<string> state + action bar with bulk operation"
+
+requirements-completed: [SITE-03, SITE-04, SITE-05]
+
+# Metrics
+duration: 3min
+completed: 2026-03-19
+---
+
+# Phase 11 Plan 03: Device-Site Assignment UI Summary
+
+**Site column in fleet table with multi-select bulk assign, site selector on device detail, and DeviceResponse site fields**
+
+## Performance
+
+- **Duration:** 3 min
+- **Started:** 2026-03-19T02:49:59Z
+- **Completed:** 2026-03-19T02:53:16Z
+- **Tasks:** 2
+- **Files modified:** 5
+
+## Accomplishments
+- DeviceResponse now includes site_id and site_name on backend and frontend
+- Fleet table has checkbox column for multi-select with bulk "Assign to site" action
+- Fleet table has Site column showing clickable site name links (or "--" for unassigned)
+- Device detail page has site selector dropdown for assign/change/remove site
+
+## Task Commits
+
+Each task was committed atomically:
+
+1. **Task 1: Add site_id and site_name to DeviceResponse** - `ddb2b3e` (feat)
+2. **Task 2: Add Site column, multi-select bulk assign, and site selector** - `98e328c` (feat)
+
+## Files Created/Modified
+- `backend/app/schemas/device.py` - Added site_id and site_name optional fields to DeviceResponse
+- `backend/app/services/device.py` - Added site fields to _build_device_response, selectinload(Device.site) to eager loading
+- `frontend/src/lib/api.ts` - Added site_id and site_name to DeviceResponse interface
+- `frontend/src/components/fleet/FleetTable.tsx` - Checkbox column, Site column, multi-select state, bulk assign dialog
+- `frontend/src/routes/_authenticated/tenants/$tenantId/devices/$deviceId.tsx` - Site selector dropdown with assign/unassign mutation
+
+## Decisions Made
+- Site column placed after Model column for logical grouping of device identity fields
+- Viewers see site name as plain text; operators get a Select dropdown for changing assignment
+- Bulk assign uses a Dialog component with site selector and mutation pattern
+
+## Deviations from Plan
+
+None - plan executed exactly as written.
+
+## Issues Encountered
+None
+
+## User Setup Required
+None - no external service configuration required.
+
+## Next Phase Readiness
+- Device-site relationship fully wired end-to-end (backend model, API, frontend views)
+- Site detail page ready for Phase 14 dashboard expansion with device list
+- All site management features operational: CRUD, assign, unassign, bulk assign
+
+## Self-Check: PASSED
+
+All 5 modified files verified on disk. Both task commits (ddb2b3e, 98e328c) verified in git log.
+
+---
+*Phase: 11-site-data-model-foundation*
+*Completed: 2026-03-19*