fix: scan the deck buffer, not the dashboard, in the statistics viewsHEADmain

With the default file scope, the dashboard rendered and exported from its own buffer, so every count read zero and cards.csv came out empty. The render, refresh, cycle, and CSV-export paths now run their card scans in the deck buffer the command was invoked from, stored buffer-locally, and a dead deck signals a clear user-error instead of scanning the wrong buffer.

Card links are now a registered org-drill-card link type with a follow handler, and the link path carries the file identity so RET jumps work across files. Eleven new ERT tests cover the render, refresh, export, link, and dead-buffer paths.

1 files changed, 7 insertions, 5 deletions

diff --git a/tests/test-org-drill-statistics-render-attention.el b/tests/test-org-drill-statistics-render-attention.el
index b3f2375..4adcfcc 100644
--- a/tests/test-org-drill-statistics-render-attention.el
+++ b/tests/test-org-drill-statistics-render-attention.el
@@ -65,8 +65,9 @@ current time so the fixture never hardcodes today."
     (test-org-drill-stats--attn-fixture)
     (let ((out (org-drill-statistics--render-attention 'file)))
       (should (string-match-p "| Card |" out))
-      (should (string-match-p "\\[\\[org-drill-card:[0-9]+\\]\\[Leech 00\\]\\]"
-                              out)))))
+      (should (string-match-p
+               "\\[\\[org-drill-card:[0-9]+@[^]]*\\]\\[Leech 00\\]\\]"
+               out)))))
 
 (ert-deftest test-org-drill-statistics-attention-cap-and-footer ()
   "Twelve leeches over a 10 cap show 10 rows and a +2 more footer."
@@ -126,15 +127,16 @@ current time so the fixture never hardcodes today."
 (ert-deftest test-org-drill-statistics-card-link-sanitizes-brackets ()
   "Closing brackets in a heading cannot terminate the link early."
   (let ((link (org-drill-statistics--card-link "a]] b" 42)))
-    (should (string-prefix-p "[[org-drill-card:42][" link))
+    (should (string-prefix-p "[[org-drill-card:42@][" link))
     (should (string-suffix-p "]]" link))
     (should-not (string-match-p "a]] b" link))))
 
 (ert-deftest test-org-drill-statistics-card-link-empty-heading-fallback ()
   "An empty heading falls back to a position-based description."
   (let ((link (org-drill-statistics--card-link "" 99)))
-    (should (string-match-p "\\[\\[org-drill-card:99\\]\\[card at 99\\]\\]"
-                            link))))
+    (should (string-match-p
+             "\\[\\[org-drill-card:99@[^]]*\\]\\[card at 99\\]\\]"
+             link))))
 
 (provide 'test-org-drill-statistics-render-attention)