fix(config_help): use --pattern for section jump; correct ov nav keys

--jump-target does not work reliably on piped stdin. Replace with
--pattern which positions ov at the first occurrence of the keyword
(works like less +/pattern) and keeps the match highlighted so the
user can press n/N to navigate further occurrences.

Also correct the section navigation keys in the offline manual:
  Space = next section  (not '.')
  ^     = previous section  (not ',')
  Alt+u = section list sidebar

functions/config_help.fish

@@ -47,23 +47,31 @@ function config_help --description 'Open the offline fish shell configuration ma
     end
 
     # ── Viewer fallback chain ────────────────────────────────────
-    # Best case: bat colors the output; ov matches headers in the ANSI stream
-    # via a regex that skips the escape codes preceding each '#'.
-    # bat emits headers as: ESC[<color>m# ... so we match ^(ESC\[[0-9;]*m)+#
-    # This is theme-agnostic (works for any 8/24-bit color sequence) and
-    # gives us both syntax highlighting AND section navigation (,/.).
+    # bat colors the output; ov matches headers via an ANSI-aware regex.
+    # bat emits: ESC[<color>m# ... so delimiter ^(\x1b\[[0-9;]*m)+# matches
+    # any 8/24-bit color sequence before a '#', theme-agnostic.
+    # Section nav: Space (next), ^ (previous), Alt+u (section list sidebar).
+    # Keyword jump uses --pattern which positions at the first search match.
     if type -q ov; and type -q bat
+        set -l ov_args \
+            --section-delimiter "^(\x1b\[[0-9;]*m)+#" \
+            --section-header
+        if test -n "$argv[1]"
+            set -a ov_args --pattern "$argv[1]"
+        end
         bat --color=always --style=plain --language=markdown "$doc_file" \
-            | ov --section-delimiter "^(\x1b\[[0-9;]*m)+#" \
-                 --section-header \
-                 --jump-target "$start_line"
+            | ov $ov_args
 
     # ov alone: section navigation on raw Markdown; no code highlighting.
     else if type -q ov
-        ov --section-delimiter "^#" \
-           --section-header \
-           --jump-target "$start_line" \
-           "$doc_file"
+        set -l ov_args \
+            --section-delimiter "^#" \
+            --section-header \
+            "$doc_file"
+        if test -n "$argv[1]"
+            set -a ov_args --pattern "$argv[1]"
+        end
+        ov $ov_args
 
     # bat alone: syntax highlighting with built-in paging; no line jump.
     else if type -q bat