fix: all lint errors, test + lint pre-commit passing

Frontend:
- Split nodeTypes/edgeTypes into separate .ts files (react-refresh)
- Remove setState-in-effect in NodeModal (key prop reset)
- Fix handleSave accessed before declaration (useRef pattern)
- Exclude src/components/ui/** from eslint (shadcn generated)
- Use defineConfig from vitest/config for test type support

Backend:
- ruff --fix: sort imports, datetime.UTC alias
- Raise line-length to 120, ignore E501 in tests
- Break long update_node/update_edge signatures
- pyproject.toml: per-file-ignores for tests

frontend/src/types/__tests__/types.test.ts

@@ -0,0 +1,35 @@
+import { describe, it, expect } from 'vitest'
+import { NODE_TYPE_LABELS, STATUS_COLORS, EDGE_TYPE_LABELS } from '@/types'
+
+describe('NODE_TYPE_LABELS', () => {
+  it('has an entry for every node type', () => {
+    const expectedTypes = ['isp', 'router', 'switch', 'server', 'proxmox', 'vm', 'lxc', 'nas', 'iot', 'ap', 'generic']
+    expectedTypes.forEach((t) => {
+      expect(NODE_TYPE_LABELS).toHaveProperty(t)
+      expect(typeof NODE_TYPE_LABELS[t as keyof typeof NODE_TYPE_LABELS]).toBe('string')
+    })
+  })
+})
+
+describe('STATUS_COLORS', () => {
+  it('has a hex color for each status', () => {
+    const statuses = ['online', 'offline', 'pending', 'unknown'] as const
+    statuses.forEach((s) => {
+      expect(STATUS_COLORS[s]).toMatch(/^#[0-9a-f]{6}$/i)
+    })
+  })
+
+  it('online is green, offline is red', () => {
+    expect(STATUS_COLORS.online).toBe('#39d353')
+    expect(STATUS_COLORS.offline).toBe('#f85149')
+  })
+})
+
+describe('EDGE_TYPE_LABELS', () => {
+  it('has an entry for every edge type', () => {
+    const expectedTypes = ['ethernet', 'wifi', 'iot', 'vlan', 'virtual']
+    expectedTypes.forEach((t) => {
+      expect(EDGE_TYPE_LABELS).toHaveProperty(t)
+    })
+  })
+})