feature fixes

src-tauri/fonts/PROVENANCE.md

@@ -0,0 +1,31 @@
+# Where these faces came from
+
+Nine static instances, cut from the four variable fonts in `public/fonts/` that the editor renders
+with. Same designs, same licence, same bytes underneath: the only difference is that a weight axis
+has been pinned rather than left open.
+
+They exist because Typst does not support a variable axis. It warns that it does not, then lays the
+text out at the default instance whatever weight was asked for, so a PDF set from the variable files
+has its headings, its bold runs and its callout labels all at 400 and no visible hierarchy at all.
+
+They live here rather than in `public/fonts/` because nothing in the webview loads them. Everything
+under `public/` is copied into the frontend bundle, and these are compiled into the binary by
+`src-tauri/src/pdf.rs`, so keeping them here ships them once instead of twice.
+
+To regenerate after updating a variable font, with fonttools installed:
+
+```python
+from fontTools.ttLib import TTFont
+from fontTools.varLib import instancer
+
+font = TTFont("public/fonts/Literata-VF.ttf")
+instancer.instantiateVariableFont(font, {"wght": 600, "opsz": 12}, inplace=True)
+# then set name IDs 1, 2, 4, 6, 16 and 17 to the family and style, and save.
+font.save("src-tauri/fonts/Literata-SemiBold.ttf")
+```
+
+Literata pins `opsz` to 12, which is its own default and the size the body text is set at. The
+weights are 400, 600 and 700 upright and 400 and 700 italic for Literata, and 400 and 700 in both
+slopes for Hanken Grotesk, which are the weights `src/export/typst.ts` asks for. Typst falls back to
+the nearest weight it has, so a face that is missing is a heading that comes out too heavy rather
+than an export that fails.