v0.12.8: complete cross-drive backup + per-tier UI

- Cross-drive now copies DB dumps (_db/) and config (_config/) alongside user data
- restic cross-drive includes config dir + full DB dump dir
- UI: per-tier rows (1. mentés / 2. mentés) instead of per-layer (DB/Konfig/Data)
- UI: BackupContents label shows what each tier protects (DB + Konfig + Adatok)
- UI: rsync backups show browsable indicator (📁)
- Cleanup: removed unused filterSnapshotsByPaths + pathCovers from router.go

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

controller/internal/web/templates/style.css

@@ -2594,3 +2594,28 @@ a.stat-card:hover {
 .text-ok { color: var(--green); }
 .text-error { color: var(--red); }
 .text-muted { color: var(--text-muted); }
+.tier-label {
+    font-weight: 600;
+    min-width: 5rem;
+    color: var(--text);
+}
+.tier-location {
+    color: var(--text-muted);
+    font-size: .85rem;
+}
+.tier-contents {
+    color: var(--text-muted);
+    font-size: .8rem;
+    font-style: italic;
+    margin-left: .25rem;
+}
+.tier-size {
+    color: var(--text-muted);
+    font-size: .8rem;
+    margin-left: .25rem;
+}
+.tier-browsable {
+    font-size: .75rem;
+    margin-left: .15rem;
+    cursor: help;
+}