perf(web/icons): per-icon lucide imports via centralised alias

Route all lucide-react icon usage through a single src/icons.ts
re-export that imports each icon from its own per-icon module
(lucide-react/dist/esm/icons/<name>) instead of the barrel.

Bundle-size impact: none (29kB icons chunk unchanged — tree-shaking
was already effective with sideEffects:false). Dev-experience win:
Vite transforms 247 modules instead of 1848 because the dep
optimiser no longer pre-bundles the full lucide barrel — faster
cold start and HMR.

Ambient d.ts declares the wildcard module so TS accepts per-icon
imports; lucide ships .d.ts only for the barrel.

Seven icons were renamed upstream and still work through the barrel
via aliases (AlertTriangle -> triangle-alert, BarChart3 -> chart-column,
CheckCircle -> circle-check-big, Filter -> funnel, PlusCircle ->
circle-plus, Sliders -> sliders-vertical, UploadCloud -> cloud-upload,
Fingerprint -> fingerprint-pattern). Component call sites stay on
the legacy names; the renames live only in icons.ts.

decnet_web/src/components/TopologyList/CreateTopologyWizard.tsx

@@ -1,5 +1,5 @@
 import React, { useCallback, useEffect, useMemo, useRef, useState } from 'react';
-import { X, Server, Cpu, FileText, Sparkles, Check } from 'lucide-react';
+import { X, Server, Cpu, FileText, Sparkles, Check } from '../../icons';
 import api from '../../utils/api';
 import { useEscapeKey } from '../../hooks/useEscapeKey';
 import { useFocusTrap } from '../../hooks/useFocusTrap';

decnet_web/src/components/TopologyList/TopologyList.tsx

@@ -1,6 +1,6 @@
 import React, { useCallback, useEffect, useState } from 'react';
 import { useNavigate } from 'react-router-dom';
-import { Network, Plus, Power, Trash2, UploadCloud, RefreshCw, Skull } from 'lucide-react';
+import { Network, Plus, Power, Trash2, UploadCloud, RefreshCw, Skull } from '../../icons';
 import api from '../../utils/api';
 import { clearLayout } from '../MazeNET/useMazeLayoutStore';
 import CreateTopologyWizard from './CreateTopologyWizard';