fix(podcasts+ui): user-test round 3 — five browser-reported defects

1. Add-modal 'Download order' never revealed: the CSS sibling selector
   (#podcast-download-all:checked ~ .podcast-add-order) can't fire —
   the checkbox was nested inside a wrapper div, so the select row was
   no SIBLING of the input. Restructured: input, label, and order row
   are now siblings under one flex-wrap wrapper.

2. Order + auto-download dropdowns always displayed the LAST option
   ('Newest first'/'Newest') regardless of the saved value: templ's
   selected={ boolExpr } compiles to selected="false" — and the mere
   PRESENCE of the attribute selects the option, so every option was
   selected and the browser honored the last. Sweep to the boolean-
   attribute form selected?={...} (omits on false) across
   podcast_detail (14), book_detail_modals (10: manga type/reading
   direction selects + abridged/explicit checkboxes — same defect,
   always-checked), collection_modal (2: hide-finished/show-up-next
   always-checked). Values were SAVING correctly all along; this was
   pure display. audio_reader/collections :selected/:checked are
   Alpine bindings — unaffected.

3. Remove Feed (and every hx-confirm) still showed the browser dialog
   for signed-in users: the global confirm modal rendered at the end
   of SidebarSignIn — signed-IN pages have no SidebarSignIn, so no
   #confirm-modal existed and confirmDialog() degraded to
   window.confirm. Moved the modal into Header proper (rendered on
   every page, after </aside>).

4. Facet bar at scale: values now carry feed COUNTS, sort by frequency
   DESC then alphabetically, cap at 6 chips per group flat, and the
   rest collapse into a native <details> '+N more' expander — hundreds
   of hosts/tags degrade gracefully instead of a wall of chips.

Verified live on the dev instance (order select reflects the saved
override, override row persists, reveal fires, modal renders on
signed-in pages). Podcast + logout + media-pin suites green; vitest
167 green.

internal/router/podcast_page.go

@@ -403,32 +403,41 @@ func podcastOrderForFeed(cfg *Config, c *echo.Context, feedID string) string {
 }
 
 // facetValuesFromCards derives the filter bar values.
-func facetValuesFromCards(feeds []templates.PodcastFeedCard) map[string][]string {
-	hosts, tags, langs := map[string]bool{}, map[string]bool{}, map[string]bool{}
+// facetValuesFromCards derives the filter-bar values with feed counts,
+// sorted by frequency DESC then alphabetically — the top of each group
+// is what a user with hundreds of feeds actually filters by.
+func facetValuesFromCards(feeds []templates.PodcastFeedCard) map[string][]templates.FacetValue {
+	hosts, tags, langs := map[string]int{}, map[string]int{}, map[string]int{}
 	for _, f := range feeds {
 		if f.Host != "" {
-			hosts[f.Host] = true
+			hosts[f.Host]++
 		}
 		for _, t := range f.Tags {
-			tags[t] = true
+			tags[t]++
 		}
 		if f.Language != "" {
-			langs[f.Language] = true
+			langs[f.Language]++
 		}
 	}
-	return map[string][]string{
-		"hosts":    sortedSet(hosts),
-		"tags":     sortedSet(tags),
-		"language": sortedSet(langs),
+	return map[string][]templates.FacetValue{
+		"hosts":    sortedFacet(hosts),
+		"tags":     sortedFacet(tags),
+		"language": sortedFacet(langs),
 	}
 }
 
-func sortedSet(set map[string]bool) []string {
-	out := make([]string, 0, len(set))
-	for k := range set {
-		out = append(out, k)
+// sortedFacet: count DESC, then value ASC (stable, scannable).
+func sortedFacet(set map[string]int) []templates.FacetValue {
+	out := make([]templates.FacetValue, 0, len(set))
+	for k, n := range set {
+		out = append(out, templates.FacetValue{Value: k, Count: n})
 	}
-	sort.Strings(out)
+	sort.Slice(out, func(i, j int) bool {
+		if out[i].Count != out[j].Count {
+			return out[i].Count > out[j].Count
+		}
+		return out[i].Value < out[j].Value
+	})
 	return out
 }