fix: remove redundant query= param from filter-specific metadata links on TFE page

Clicking orientation, AP program, finality, year, format, or keyword links
on the TFE page was passing both a dedicated filter param AND a query=
param. The query= text search doesn't look at the filter columns
(orientation, ap_program, etc.), so the AND combination yielded zero
results when the filter value didn't appear in title/authors/etc fields.

Also fix the language link: it was passing language as query= which
searches only title/authors/etc, not the languages column. Now uses
the dedicated language= param (DB layer already supported it, and
collectSearchParams now collects it).

app/public/assets/css/repertoire.css

@@ -770,7 +770,6 @@
 /* ── Collapsible filter controls ─────────────────────────────────── */
 .search-filters-toggle {
   flex-shrink: 0;
-  border-bottom: 1px solid var(--border-secondary);
 }
 
 .search-filters-summary {

app/public/assets/css/tfe.css

@@ -13,7 +13,6 @@
 .tfe-content-row {
   display: grid;
   grid-template-columns: 49vw 1fr;
-  /* gap: var(--space-xl); */
   width: 100%;
   height: 100%;
   min-height: 0;
@@ -24,6 +23,8 @@
   overflow-y: auto;
   min-width: 0;
   padding: var(--space-xl) var(--space-m) var(--space-xl) var(--space-m);
+  padding-right: 0.5ch;
+  gap: 1ch;
 }
 
 .tfe-right-column {
@@ -34,13 +35,6 @@
   padding: var(--space-xl) var(--space-m) var(--space-xl) var(--space-m);
 }
 
-/* Left column: stacks author, title, meta, synopsis — scrolls independently */
-.tfe-left-column {
-  gap: var(--space-m);
-  /* to space the edge of the text and the scrollbar */
-  padding-right: 0.5ch;
-}
-
 /* Files container inside right column — flex kept for PDF expand-to-fill behavior */
 .tfe-files {
   display: grid;
@@ -555,6 +549,7 @@ body.pdf-viewer-open {
   .tfe-left-column,
   .tfe-right-column {
     overflow-y: visible;
+    padding: var(--space-3xs);
   }
 
   .tfe-title {
@@ -569,6 +564,11 @@ body.pdf-viewer-open {
     height: auto;
     min-height: unset;
     background: color-mix(in srgb, var(--accent-secondary) 92%, #000 8%);
+    border: none;
+    border-radius: 0;
+  }
+  .pdf-toolbar {
+    border-radius: 0 0 var(--radius) var(--radius);
   }
 
   .tfe-file-iframe {