Fix some regressions with the graphs when printing

- page-break avoidance needs to be moved to the wrapping TitledContainer
- grid has to be disabled, as it prevents page breaks from working, and
shows too many columns (https://forums.ankiweb.net/t/stats-save-as-pdf-problems-2-1-55/25773)
- content underflowed the top header

ts/components/TitledContainer.svelte

@@ -64,6 +64,7 @@ License: GNU AGPL, version 3 or later; http://www.gnu.org/licenses/agpl.html
             }
         }
         transition: box-shadow 0.2s ease-in-out;
+        page-break-inside: avoid;
     }
     h1 {
         border-bottom: 1px solid var(--border);

ts/graphs/Graph.svelte

@@ -21,8 +21,6 @@ License: GNU AGPL, version 3 or later; http://www.gnu.org/licenses/agpl.html
 <style lang="scss">
     @use "sass/elevation" as *;
     .graph {
-        page-break-inside: avoid;
-
         /* See graph-styles.ts for constants referencing global styles */
         :global(.graph-element-clickable) {
             cursor: pointer;

ts/graphs/GraphsPage.svelte

@@ -78,6 +78,12 @@ License: GNU AGPL, version 3 or later; http://www.gnu.org/licenses/agpl.html
         @media only screen and (max-width: 600px) {
             font-size: 12px;
         }
+
+        @media only print {
+            // grid layout does not honor page-break-inside
+            display: block;
+            margin-top: 3em;
+        }
     }
 
     .spacer {