epub, html: reference issues fixes

- _part_eof.xhtml was declared in the manifest and never written.
- image_sys/bullet_09.png was referenced as a background image, a
  throwback to the Ruby version of sisu, never used here.

(assisted by Claude-Code)

4 files changed, 16 insertions, 24 deletions

diff --git a/org/out_xmls.org b/org/out_xmls.org
index 5b989df..786d164 100644
--- a/org/out_xmls.org
+++ b/org/out_xmls.org
@@ -3122,6 +3122,10 @@ case "backmatter":
      is not listed again.
 +/
 if (obj.metainfo.is_a == "heading"
+  /+ ↓ "tail" is the end of document marker, and no file is written for it (the
+       writing loop skips the section), so it is not in the manifest either.
+  +/
+  && section != "tail"
   && obj.metainfo.heading_lev_markup <= 4
   && obj.tags.segment_anchor_tag_epub.length > 0
   && !(obj.tags.segment_anchor_tag_epub in _segment_files_seen)
diff --git a/org/out_xmls_css.org b/org/out_xmls_css.org
index 4e17d1a..095926a 100644
--- a/org/out_xmls_css.org
+++ b/org/out_xmls_css.org
@@ -678,9 +678,7 @@ ul, li {
   margin-top               : 3px;
   margin-bottom            : 3px;
 }
-li {
-  background               : url(../image_sys/bullet_09.png) no-repeat 0px 6px;
-}
+li { }   /* bullets are rendered as text; the background image was never shipped */
 ul { }
 #+END_SRC
 
@@ -1611,9 +1609,7 @@ ul, li {
   margin-top               : 3px;
   margin-bottom            : 3px;
 }
-li {
-  background               : (../image_sys/bullet_09.png) no-repeat 0px 6px;
-}
+li { }   /* bullets are rendered as text; the background image was never shipped */
 ul { }
 #+END_SRC
 
diff --git a/src/sisudoc/outputs/io_out/epub3.d b/src/sisudoc/outputs/io_out/epub3.d
index 1c08bab..b606e7a 100644
--- a/src/sisudoc/outputs/io_out/epub3.d
+++ b/src/sisudoc/outputs/io_out/epub3.d
@@ -565,6 +565,10 @@ template outputEPub3() {
              is not listed again.
         +/
         if (obj.metainfo.is_a == "heading"
+          /+ ↓ "tail" is the end of document marker, and no file is written for it (the
+               writing loop skips the section), so it is not in the manifest either.
+          +/
+          && section != "tail"
           && obj.metainfo.heading_lev_markup <= 4
           && obj.tags.segment_anchor_tag_epub.length > 0
           && !(obj.tags.segment_anchor_tag_epub in _segment_files_seen)
diff --git a/src/sisudoc/outputs/io_out/xmls_css.d b/src/sisudoc/outputs/io_out/xmls_css.d
index 21f9f59..7a13885 100644
--- a/src/sisudoc/outputs/io_out/xmls_css.d
+++ b/src/sisudoc/outputs/io_out/xmls_css.d
@@ -915,9 +915,7 @@ ul, li {
   margin-top               : 3px;
   margin-bottom            : 3px;
 }
-li {
-  background               : url(../image_sys/bullet_09.png) no-repeat 0px 6px;
-}
+li { }   /* bullets are rendered as text; the background image was never shipped */
 ul { }
 h0, h1, h2, h3, h4, h5, h6, h7 {
   font-weight              : bold;
@@ -1705,9 +1703,7 @@ ul, li {
   margin-top               : 3px;
   margin-bottom            : 3px;
 }
-li {
-  background               : (../image_sys/bullet_09.png) no-repeat 0px 6px;
-}
+li { }   /* bullets are rendered as text; the background image was never shipped */
 ul { }
 h0, h1, h2, h3, h4, h5, h6, h7 {
   font-weight              : bold;
@@ -2506,9 +2502,7 @@ ul, li {
   margin-top               : 3px;
   margin-bottom            : 3px;
 }
-li {
-  background               : url(../image_sys/bullet_09.png) no-repeat 0px 6px;
-}
+li { }   /* bullets are rendered as text; the background image was never shipped */
 ul { }
 h0, h1, h2, h3, h4, h5, h6, h7 {
   font-weight              : bold;
@@ -3222,9 +3216,7 @@ ul, li {
   margin-top               : 3px;
   margin-bottom            : 3px;
 }
-li {
-  background               : (../image_sys/bullet_09.png) no-repeat 0px 6px;
-}
+li { }   /* bullets are rendered as text; the background image was never shipped */
 ul { }
 h0, h1, h2, h3, h4, h5, h6, h7 {
   font-weight              : bold;
@@ -3949,9 +3941,7 @@ ul, li {
   margin-top               : 3px;
   margin-bottom            : 3px;
 }
-li {
-  background               : url(../image_sys/bullet_09.png) no-repeat 0px 6px;
-}
+li { }   /* bullets are rendered as text; the background image was never shipped */
 ul { }
 h0, h1, h2, h3, h4, h5, h6, h7 {
   font-weight              : bold;
@@ -4505,9 +4495,7 @@ ul, li {
   margin-top               : 3px;
   margin-bottom            : 3px;
 }
-li {
-  background               : (../image_sys/bullet_09.png) no-repeat 0px 6px;
-}
+li { }   /* bullets are rendered as text; the background image was never shipped */
 ul { }
 h0, h1, h2, h3, h4, h5, h6, h7 {
   font-weight              : bold;