feat: roadmap items #7 #8 #9 #10 — recent files, semver tag, search filters, dedup

- #7: Section « Récents » dans la page d'accueil vault (5 derniers fichiers)
- #8: Git tag v1.8.0
- #9: Filtres search avancés created:/modified:/size: avec parsing dates/sizes
- #10: Déduplication IGNORED_DIRS (indexer.py source unique, watcher+main importent)
- ROADMAP: tous les items marqués FAIT, version → 1.9.0

frontend/style.css

@@ -4114,6 +4114,77 @@ body.resizing-v {
   font-size: 0.85rem;
 }
 
+/* ── Recent files section on vault home ── */
+.vault-home-recent {
+  margin-bottom: 20px;
+  padding: 12px 16px;
+  background: var(--bg-secondary);
+  border: 1px solid var(--border);
+  border-radius: 8px;
+}
+
+.vault-home-recent-header {
+  display: flex;
+  align-items: center;
+  gap: 6px;
+  font-size: 0.75rem;
+  font-weight: 600;
+  color: var(--text-muted);
+  text-transform: uppercase;
+  letter-spacing: 0.05em;
+  margin-bottom: 8px;
+  padding-bottom: 6px;
+  border-bottom: 1px solid var(--border);
+}
+
+.vault-home-recent-list {
+  display: flex;
+  flex-direction: column;
+  gap: 2px;
+}
+
+.vault-home-recent-item {
+  display: flex;
+  align-items: center;
+  gap: 8px;
+  padding: 5px 6px;
+  border-radius: 4px;
+  cursor: pointer;
+  transition: background 0.12s;
+  font-size: 0.82rem;
+}
+
+.vault-home-recent-item:hover {
+  background: color-mix(in srgb, var(--accent) 8%, transparent);
+}
+
+.vault-home-recent-title {
+  color: var(--text-primary);
+  font-weight: 500;
+  flex: 1;
+  min-width: 0;
+  overflow: hidden;
+  text-overflow: ellipsis;
+  white-space: nowrap;
+}
+
+.vault-home-recent-dir {
+  color: var(--text-muted);
+  font-size: 0.72rem;
+  font-family: var(--font-mono);
+  max-width: 180px;
+  overflow: hidden;
+  text-overflow: ellipsis;
+  white-space: nowrap;
+}
+
+.vault-home-recent-time {
+  color: var(--text-muted);
+  font-size: 0.7rem;
+  white-space: nowrap;
+  flex-shrink: 0;
+}
+
 .vault-home-item {
   cursor: pointer;
 }