fix repertoire AP/OR/FI columns and main scroll containment

- repertoire-index.php: add $colHasMatches per-column guard.
  Entries in a column are only faded when that column has at least one
  matched entry in the current result set. When a dimension has no
  matched entries (e.g. no thesis has orientation_id set yet), the
  entire column stays fully interactive — all values remain clickable.
  This fixes: empty columns, forced single-select, cascade fading.

- Database.php: revert allAp/allOr/allFi to full lookup-table queries
  so all known values are always shown (not just ones linked to theses).

- common.css: body is now a flex column; main gets flex:1 + min-height:0;
  header-search-wrap gets flex-shrink:0; duplicate html/body blocks merged.
- public.css: removed redundant top-level main block; home-main gets min-height:0.
- repertoire.css: search-main gets min-height:0 for proper flex scroll.

app/public/assets/css/common.css

@@ -11,6 +11,7 @@ body {
     margin: 0;
     padding: 0;
     height: 100%;
+    overflow: hidden;
 }
 
 body {
@@ -22,13 +23,8 @@ body {
         rgba(0, 0, 0, 0) 92%,
         rgba(149, 87, 181, 1) 100%
     );
-}
-
-html,
-body {
-    margin: 0;
-    height: 100%;
-    overflow: hidden;
+    display: flex;
+    flex-direction: column;
 }
 
 a {
@@ -132,7 +128,8 @@ body > header nav ul a[aria-current="page"] {
 }
 
 main {
-    overflow: scroll;
+    flex: 1;
+    min-height: 0;
 }
 
 /* ============================================================
@@ -140,8 +137,8 @@ main {
    ============================================================ */
 .header-search-wrap {
     padding: 0 0;
+    flex-shrink: 0;
     background-color: var(--gradient-4);
-
     background: linear-gradient(180deg, var(--gradient-4) 0%, #ffffffee 100%);
 }