feat: improve synthesis list cards with time, all categories, and uniform height

- Add generation time below date in synthesis cards
- Show all categories with article count in parentheses
- Use flex-col layout for uniform card height
- Add sections_summary to SynthesisListItem API response
- Add formatTime utility

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

backend/src/models/synthesis.rs

@@ -84,9 +84,17 @@ pub struct SynthesisListItem {
     pub created_at: DateTime<Utc>,
     pub first_section_title: Option<String>,
     pub first_section_item_count: usize,
+    pub sections_summary: Vec<SectionSummary>,
     pub job_id: Option<Uuid>,
 }
 
+/// Summary of a section for the synthesis list view.
+#[derive(Debug, Serialize)]
+pub struct SectionSummary {
+    pub title: String,
+    pub count: usize,
+}
+
 impl TryFrom<Synthesis> for SynthesisListItem {
     type Error = crate::errors::AppError;
 
@@ -98,6 +106,14 @@ impl TryFrom<Synthesis> for SynthesisListItem {
         let first_section_title = first.map(|sec| sec.title.clone());
         let first_section_item_count = first.map(|sec| sec.items.len()).unwrap_or(0);
 
+        let sections_summary: Vec<SectionSummary> = sections
+            .iter()
+            .map(|sec| SectionSummary {
+                title: sec.title.clone(),
+                count: sec.items.len(),
+            })
+            .collect();
+
         Ok(Self {
             id: s.id,
             week: s.week,
@@ -105,6 +121,7 @@ impl TryFrom<Synthesis> for SynthesisListItem {
             created_at: s.created_at,
             first_section_title,
             first_section_item_count,
+            sections_summary,
             job_id: s.job_id,
         })
     }

frontend/src/__tests__/fixtures.ts

@@ -17,6 +17,10 @@ export const MOCK_SYNTHESIS_LIST_ITEM: SynthesisListItem = {
   created_at: '2026-03-21T10:00:00Z',
   first_section_title: 'Annonces majeures',
   first_section_item_count: 3,
+  sections_summary: [
+    { title: 'Annonces majeures', count: 3 },
+    { title: 'Recherche', count: 2 },
+  ],
   job_id: 'job-test-1',
 };
 

frontend/src/pages/Home.tsx

@@ -12,7 +12,7 @@ import { useI18n } from '~/i18n';
 import { synthesesApi } from '~/api/syntheses';
 import { isApiError } from '~/types';
 import type { SynthesisListItem } from '~/types';
-import { extractWeekNumber, formatDate } from '~/utils/dates';
+import { extractWeekNumber, formatDate, formatTime } from '~/utils/dates';
 import LoadingSpinner from '~/components/ui/LoadingSpinner';
 
 /**
@@ -168,29 +168,34 @@ const Home: Component = () => {
               {(synth) => (
                 <A
                   href={`/synthesis/${synth.id}`}
-                  class="block bg-white rounded-xl shadow-sm border border-gray-200 hover:shadow-md hover:border-indigo-300 transition-all duration-200 overflow-hidden"
+                  class="flex flex-col bg-white rounded-xl shadow-sm border border-gray-200 hover:shadow-md hover:border-indigo-300 transition-all duration-200 overflow-hidden"
                 >
-                  <div class="p-6">
+                  <div class="p-6 flex-1">
                     <div class="flex items-center justify-between mb-4">
                       <span class="inline-flex items-center px-2.5 py-0.5 rounded-full text-xs font-medium bg-indigo-100 text-indigo-800">
                         {t('home.weekLabel', { week: extractWeekNumber(synth.week) })}
                       </span>
-                      <span class="text-sm text-gray-500">
-                        {formatDate(synth.created_at)}
-                      </span>
+                      <div class="text-right">
+                        <div class="text-sm text-gray-500">{formatDate(synth.created_at)}</div>
+                        <div class="text-xs text-gray-400">{formatTime(synth.created_at)}</div>
+                      </div>
                     </div>
-                    <h3 class="text-lg font-semibold text-gray-900 mb-2">
+                    <h3 class="text-lg font-semibold text-gray-900 mb-3">
                       {t('home.cardTitle')}
                     </h3>
-                    <div class="text-sm text-gray-600 space-y-1.5">
+                    <div class="space-y-1">
                       <Show
-                        when={synth.first_section_title}
-                        fallback={<p>{t('home.noPreview')}</p>}
+                        when={synth.sections_summary && synth.sections_summary.length > 0}
+                        fallback={<p class="text-sm text-gray-400">{t('home.noPreview')}</p>}
                       >
-                        <p class="font-medium text-gray-700">{synth.first_section_title}</p>
-                        <p class="text-gray-500">
-                          {t('home.previewCount', { count: String(synth.first_section_item_count) })}
-                        </p>
+                        <For each={synth.sections_summary}>
+                          {(section) => (
+                            <div class="flex items-center justify-between text-sm">
+                              <span class="text-gray-700 truncate mr-2">{section.title}</span>
+                              <span class="text-gray-400 text-xs whitespace-nowrap">({section.count})</span>
+                            </div>
+                          )}
+                        </For>
                       </Show>
                     </div>
                   </div>

frontend/src/types.ts

@@ -133,6 +133,11 @@ export interface Synthesis {
   created_at: string;
 }
 
+export interface SectionSummary {
+  title: string;
+  count: number;
+}
+
 export interface SynthesisListItem {
   id: string;
   week: string;
@@ -140,6 +145,7 @@ export interface SynthesisListItem {
   created_at: string;
   first_section_title: string | null;
   first_section_item_count: number;
+  sections_summary: SectionSummary[];
   job_id: string | null;
 }
 

frontend/src/utils/dates.ts

@@ -27,6 +27,17 @@ export function formatDate(isoDate: string): string {
   }
 }
 
+/**
+ * Format an ISO date string as "10:30".
+ */
+export function formatTime(isoDate: string): string {
+  try {
+    return format(parseISO(isoDate), 'HH:mm', { locale: fr });
+  } catch {
+    return '';
+  }
+}
+
 /**
  * Format an ISO date string as "21 mars 2026" (full month name).
  */