Add Writing Desk paper copying and ink meter

README.md

@@ -19,12 +19,18 @@ hand and use the Ink Vial in the other to prepare a baseline Link Panel Page.
 Each vial holds 16 ink units, and the default link-panel cost is two units.
 The spent vial returns a glass bottle. Server owners can adjust the symbol-copy
 and link-panel costs in the `writing` section of `rivencraft-server.toml`.
-Symbol-page transcription will become available through the Writing Desk.
+The Writing Desk can copy a selected written page from its collection tabs.
 The Writing Desk is now craftable from planks, a glass bottle, and a feather.
-Its four collection tabs, ink/source/page work slots, and inventory persist
+Its four collection tabs, paper input, ink vial input, empty glass-bottle return,
+16-unit ink meter, and inventory persist
 through world saves; breaking it drops stored contents. The desk screen is a
 functional foundation styled after Legacy's left tabs, central writing surface,
-and right inventory. Transcription controls are not implemented yet.
+and right inventory. Put vanilla paper (or a blank Rivencraft Page) in the
+upper-left slot and Ink Vials in the upper-right; a copy appears in the
+lower-left result slot when the selected page is valid. Taking it consumes one
+paper and, by default, one ink. An empty meter consumes a vial to refill and
+returns a vanilla glass bottle to the lower-right slot. Writing new symbols
+from a catalog remains future work.
 Selecting a stored page on the desk surface shows its Legacy-proportioned
 portrait preview and name above the player inventory.