bibliography: citar + biblio + org-cite CSL setup

- init.el: biblio module with +citar flag
- packages.el: citeproc for org-cite CSL export
- config.el: citar (browse/insert/notes), biblio (online search),
  org-cite with CSL processor, bibtex editing defaults
- Keybindings under SPC b: browse, insert, notes, search online
- Auto-creates ~/org/references.bib if missing

config.el

@@ -1807,18 +1807,59 @@ Skip for beamer exports — beamer uses adjustbox on plain tabular."
 
 
 ;;; ============================================================
-;;; BIBTEX / CITAR
+;;; BIBLIOGRAPHY — citar + biblio + org-cite
 ;;; ============================================================
+;; Workflow:
+;;   1. SPC b s → search CrossRef/DBLP/arXiv by author/title/DOI
+;;   2. In results: select entry → i = insert into references.bib
+;;   3. In org file: SPC b i → search your .bib → insert [cite:@key]
+;;   4. Export to PDF: citations auto-formatted, bibliography generated
+;;
+;; Files:
+;;   ~/org/references.bib  — master bibliography (auto-created if missing)
+;;   ~/org/notes/           — reading notes per reference
+;;   ~/org/papers/          — PDF library (optional)
 
 (after! citar
   (setq citar-bibliography '("~/org/references.bib")
         citar-notes-paths '("~/org/notes/")
         citar-library-paths '("~/org/papers/"))
-  (map! :leader
-        "b b" #'citar-open
-        "b i" #'citar-insert-citation
-        "b n" #'citar-open-notes
-        "b r" #'citar-refresh))
+
+  ;; Ensure references.bib exists
+  (let ((bib (expand-file-name "~/org/references.bib")))
+    (unless (file-exists-p bib)
+      (with-temp-file bib (insert "% Bibliography — managed via citar + biblio\n\n")))))
+
+;; org-cite: use CSL processor (no BibLaTeX/BibTeX toolchain needed)
+(after! oc
+  (require 'citeproc)
+  (setq org-cite-global-bibliography '("~/org/references.bib")
+        org-cite-export-processors '((latex csl)
+                                     (html csl)
+                                     (t csl))))
+
+;; biblio.el: search and import references from online databases
+(after! biblio
+  (setq biblio-crossref-user-email-address "martin@sukany.cz"))
+
+;; BibTeX editing defaults
+(setq bibtex-dialect 'biblatex
+      bibtex-autokey-year-length 4
+      bibtex-autokey-name-year-separator ""
+      bibtex-autokey-year-title-separator "-"
+      bibtex-autokey-titleword-length 5
+      bibtex-autokey-titlewords 3)
+
+(map! :leader
+      (:prefix ("b" . "bibliography")
+       :desc "Browse references"        "b" #'citar-open
+       :desc "Insert citation"          "i" #'citar-insert-citation
+       :desc "Open notes for reference" "n" #'citar-open-notes
+       :desc "Refresh bibliography"     "r" #'citar-refresh
+       :desc "Search online (CrossRef)" "s" #'biblio-crossref-lookup
+       :desc "Search arXiv"             "a" #'biblio-arxiv-lookup
+       :desc "Search DBLP"              "d" #'biblio-dblp-lookup
+       :desc "Search DOI"               "D" #'biblio-doi-insert-bibtex))
 
 
 ;;; ============================================================

init.el

@@ -46,7 +46,7 @@
 
        :tools
        ansible
-       biblio
+       (biblio +citar)
        debugger
        docker
        (eval +overlay)

packages.el

@@ -109,6 +109,9 @@
 (package! combobulate :recipe (:host github :repo "mickeynp/combobulate"))
 (package! breadcrumb :recipe (:host github :repo "joaotavora/breadcrumb"))
 
+;; Bibliography: CSL citation processor for org-cite export
+(package! citeproc)
+
 ;; Tier 3 — Supplementary
 (package! org-anki)
 (package! org-ql)