feat: tooltips universels sur l'ensemble du site

- CampaignsView: Score menace, JA4, ASN, Tendance, Score, Détections, Confiance
- FingerprintsView: colonnes avec tooltips via DataTable
- JA4InvestigationView: IPs Uniques, JA4, ASN, Score
- SubnetInvestigation: colonnes clés avec tooltips
- CorrelationGraph: légende et badges
- EntityInvestigationView: sections headers, JA4, ASN
- IncidentsView: stat cards, sévérité, ASN, Score de risque
- Fix: suppression des imports dupliqués dans CampaignsView

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

frontend/src/components/EntityInvestigationView.tsx

@@ -1,5 +1,7 @@
 import { useParams, useNavigate } from 'react-router-dom';
 import { useEffect, useState } from 'react';
+import { InfoTip } from './ui/Tooltip';
+import { TIPS } from './ui/tooltips';
 
 interface EntityStats {
   entity_type: string;
@@ -194,7 +196,7 @@ export function EntityInvestigationView() {
 
         {/* Panel 2: JA4 Fingerprints */}
         <div className="bg-background-secondary rounded-lg p-6 mb-6">
-          <h3 className="text-lg font-medium text-text-primary mb-4">2. JA4 Fingerprints</h3>
+          <h3 className="text-lg font-medium text-text-primary mb-4"><span className="flex items-center gap-1">2. JA4 Fingerprints<InfoTip content={TIPS.ja4} /></span></h3>
           <div className="space-y-2">
             {data.related.ja4s.slice(0, 10).map((ja4, idx) => (
               <div key={idx} className="flex items-center justify-between bg-background-card rounded-lg p-3">
@@ -251,7 +253,7 @@ export function EntityInvestigationView() {
 
         {/* Panel 4: Client Headers */}
         <div className="bg-background-secondary rounded-lg p-6 mb-6">
-          <h3 className="text-lg font-medium text-text-primary mb-4">4. Client Headers</h3>
+          <h3 className="text-lg font-medium text-text-primary mb-4"><span className="flex items-center gap-1">4. Client Headers<InfoTip content={TIPS.accept_encoding} /></span></h3>
           <div className="space-y-3">
             {data.client_headers.slice(0, 10).map((header, idx) => (
               <div key={idx} className="bg-background-card rounded-lg p-3 space-y-2">
@@ -347,7 +349,7 @@ export function EntityInvestigationView() {
         <div className="grid grid-cols-1 md:grid-cols-2 gap-6 mb-6">
           {/* ASNs */}
           <div className="bg-background-secondary rounded-lg p-6">
-            <h3 className="text-lg font-medium text-text-primary mb-4">ASNs</h3>
+            <h3 className="text-lg font-medium text-text-primary mb-4"><span className="flex items-center gap-1">ASNs<InfoTip content={TIPS.asn} /></span></h3>
             <div className="space-y-2">
               {data.related.asns.slice(0, 10).map((asn, idx) => (
                 <div key={idx} className="bg-background-card rounded-lg p-3">