fix(config_help): use ANSI-aware section delimiter for bat+ov pipeline

bat emits Markdown headers as ESC[<color>m# so the raw ^# regex never
matches. Use ^(\x1b\[[0-9;]*m)+# instead — matches one or more ANSI
escape sequences before the # regardless of theme or color depth.
Restores section navigation (,/.) while keeping bat syntax highlighting.

functions/config_help.fish

@@ -47,14 +47,18 @@ function config_help --description 'Open the offline fish shell configuration ma
     end
 
     # ── Viewer fallback chain ────────────────────────────────────
-    # Best case: bat provides syntax color, ov provides paging + line jump.
-    # Section nav (,/.) is sacrificed when piping bat output because ANSI
-    # escape codes prevent ^# matching; use / to search instead.
+    # 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 (,/.).
     if type -q ov; and type -q bat
         bat --color=always --style=plain --language=markdown "$doc_file" \
-            | ov --jump-target "$start_line"
+            | ov --section-delimiter "^(\x1b\[[0-9;]*m)+#" \
+                 --section-header \
+                 --jump-target "$start_line"
 
-    # ov alone: full section navigation with ,/. keys; no code highlighting.
+    # ov alone: section navigation on raw Markdown; no code highlighting.
     else if type -q ov
         ov --section-delimiter "^#" \
            --section-header \