References you can see through

A tag is mostly references to other tags, and until now each one was a line of text and an Open button that silently did nothing when the path did not resolve. This release is about making those edges visible and fast to walk — in both directions.

Added

• Reference previews. The group code at the end of every reference row is now a preview chip: rest the pointer on it (or click to pin) and a card shows what is on the other end — an inline sound player, a model tag's collision shell slowly turning, or the tag's identity — with an open link. Nothing is decoded until you dwell on a chip, so sweeping through a form costs nothing. (A thumbnail card exists for texture-binding tags too, but no CU4 tag binds one; it is there for the build that does.)
• Broken references show themselves. Every reference field is checked when a tag opens. One that points at nothing in this installation turns red, says missing, and its Open is disabled — where before the button just did nothing.
• Referenced by. Under the tag header, next to linked assets: every tag whose fields point at the open one. The first expand scans every shipped tag (up to a minute, once per session); after that it is instant. This replaces the CLI grep the guide used to suggest.
• Back and forward. Alt+Left / Alt+Right walk the documents you visited, reference-follows included. Going back to a tab you closed reopens it.
• Ctrl+P quick-open. Type a tag name, Enter opens it; name matches rank above path matches. With nothing typed it lists your 20 most recent tags, remembered by name across launches — so the list survives game updates.
• Ctrl+PageDown / Ctrl+PageUp switch tabs.

Changed

• Open on a reference row resolves exactly. Four-CC or group name, authored backslash paths, the cooker's _Generated_ folder — all handled by an indexed exact lookup instead of the old fuzzy search, which capped at 500 rows and could open a lookalike or fail without a word. A miss now says reference not found in the edit bar.