Port collections, dropped books, return links and Writing Desk to 26.3

ports/mc263/RELEASE_NOTES_1.0.1.106-beta.1.md

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+# Rivencraft 26.3 beta 1.0.1.106-beta.1
+
+Collects the player-validated port slices .99–.106 since 1.0.1.98-beta.1.
+This beta is not yet feature-complete with Minecraft 1.21.1.
+
+## Books and travel
+
+- Fallback Age platforms now use the dedicated non-collectible platform block
+  from 1.21.1: opaque crystal texture, glass-like breaking strength, no drops
+  or pick-block item. Existing ordinary Crystal Block platforms are unchanged.
+- Ported automatic Return Links for successful handheld Descriptive Book
+  travel. `descriptive_books.return_link_mode` in `config/rivencraft-local.toml`
+  defaults to **DISABLED**. `ON_CREATION` issues one on the first arrival per
+  Age/world with that mode enabled; `ALWAYS` issues one on each arrival.
+- Return Links preserve departure dimension, position and facing. They are
+  issued after Disarm and drop at the destination if inventory is full.
+  First-arrival records persist across reload, reseeding and restart.
+- Successful handheld Linking and Descriptive Book travel now leaves the
+  active book at departure as a recoverable open-book entity. Both hands are
+  supported. Failed travel or canceled entity spawning restores the book.
+- Dropped books reuse the existing textures and skyward-facing model. They
+  have a one-second pickup delay, no ordinary five-minute expiry, slow decay
+  and water/rain damage, matching 1.21.1. Their components and decay counter
+  persist through restart.
+
+## Page collections and binding
+
+- Ported Notebooks and Collation Folders with their existing editor and assets,
+  capacities of 252 and 27 positions, sparse page storage, search, scrolling,
+  page movement and inventory transfers. Link Panels are rejected by the editor.
+- Notebook crafting uses the existing leather/string pattern. The held
+  collection is locked against ordinary menu movement. Escape closes the menu
+  with search focused; search still consumes inventory/hotbar shortcuts.
+- Corrected the port's keyboard and mouse-button mappings, including arrow
+  movement, right-click handling and scrollbar dragging.
+- The Book Binder accepts collection imports: shift-click to append pages or
+  click a carried collection on the strip to insert them. Empty positions are
+  skipped and occupied page order is retained. Imports validate all inputs and
+  capacity before committing; successful imports return the empty collection.
+- Added category Symbol Portfolios to Creative, including registry-derived
+  biome, material and fluid pages. Large categories split into volumes of up
+  to 252 pages. Portfolios use the editor and Binder import flow.
+- Sealed Notebooks open into Folders containing 16 random pages using the
+  1.21.1 pool/exclusions. Survival consumes one; Creative retains the item.
+  Full inventories receive a dropped Folder. No new recipes are invented for
+  Folders, Portfolios or Sealed Notebooks; discovery/library loot is pending.
+
+## Writing Desk
+
+- Ported the two-block Writing Desk, its existing model/textures, selected-page
+  and white paper-stack display, and Legacy GUI atlases.
+- Ported 88 tabs cycled four at a time, category/search/sort/ALL views, collection
+  and loose-page storage, page movement/extraction, and server-owned catalog
+  synchronization. Link Panels cannot be stored or copied in the desk.
+- Copy previews are virtual. Taking a copy consumes one paper and one ink by
+  default while retaining the original page. `writing.symbol_ink_cost` is
+  configurable in `rivencraft-local.toml`.
+- Vials fill a 16-unit meter and return vanilla glass bottles. Refills are
+  event-driven and require bottle space. Full inventory prevents shift-copy
+  consumption. Unknown pages are retained but cannot be copied unresolved.
+- Ported crafting and adapted its recipe-unlock advancement to 26.3.
+  Removing either desk half removes its partner and drops contents once.
+- Further corrections to the desk model, focused on page/paper placement,
+  remain tracked for both versions in issue #113.
+
+## Compatibility and validation
+
+- Requires Minecraft **26.3**, NeoForge **26.3.0.99**, and **Java 25**. Dynamic
+  Dimensions and Bad Packets are not required. The 1.21.1 implementation is
+  unchanged. Use matching client/server builds; Age catalog protocol remains 10.
+- Player in-game checks passed. Both build targets passed. Targeted disposable
+  server fixtures covered ownership recovery, collection/copy transactions,
+  save/network codecs, block removal, reload/reseed and restart persistence.
+  Servers were stopped and test worlds removed. This was not a full GameTest run.
+- Full writing recovery, remaining discovery/stations, instability, crystal
+  portals, progression awards and optional integration parity remain unfinished.
+  JEI guides and discovery loot for the newly ported interactions are pending.
+  Unsupported effects remain marked red; Creative availability is not parity.
+- Back up saves. New Native Cave profiles from .97 onward cannot be read by
+  earlier betas, and newly ported items/entities also require the newer build.
+  Keep 1.21.1 and 26.3 saves separate. Machine acceleration (#112) and Native
+  Cave default biome-pool policy (#111) remain separate planned work.
+
+Report issues and help improve the wiki at
+[BlackSheep Git](https://git.paddedcell.org/dnorberg/rivencraft).