docs: clear wiki-checklist debt for /display and What's That Card updates

docs/user-guide.md

@@ -10,6 +10,16 @@ it. See [`documentation-process.md`](documentation-process.md).
 How to search the catalog, read search results, and pick a printing for
 a slot in your decklist.
 
+The **Display** page's search bar is dual-mode: an **Add / Browse**
+toggle next to the input switches between adding cards to your project
+(the usual decklist-line paste/search box) and browsing the whole
+catalog without touching your project — browsing renders a grid of
+matching cards you can add individually, and the center of the page
+follows the same toggle, switching between your print sheet preview and
+the browse results. The **+ Add Cards** dropdown next to the search box
+covers the same Text / XML / CSV / URL import options available
+elsewhere in the app.
+
 ## "What's That Card?" — helping identify printings
 
 ProxyPrints crowdsources which real Magic printing a community-submitted
@@ -18,6 +28,17 @@ etc.) can be more precise. If you spot the vote queue while browsing,
 here's what it's asking and why your input helps everyone's search
 results.
 
+The vote queue at **What's That Card?** presents each question as a
+quiz-reveal hero: the card image in question sits in its own column on
+a deep-blue hero field (with an animated starburst behind it) alongside
+a title that pops into place word by word every time a new card is
+shown, while the actual question — the candidate printings or attribute
+chips to pick from — sits in a scrolling panel beside it. On a wide
+screen that question panel scrolls on its own while the card stays put,
+so you never lose sight of what you're being asked about; on a narrow
+screen the card instead pins near the top of the screen while the
+questions scroll underneath it.
+
 ## Exporting a print-ready PDF
 
 How to arrange your chosen cards into pages, set bleed/DPI/paper size,
@@ -31,10 +52,29 @@ sheet; the other two trade some bleed for a printer-supported margin,
 and the page warns (rather than silently shrinking your bleed value) if
 your current bleed exceeds what the selected profile can fit.
 
+The same section's **Card spacing (mm)** control sets the gutter between
+cards independently on each axis — Horizontal (X) and Vertical (Y)
+default to 0mm and 14.5mm respectively, so columns butt together for
+strip-cutting while rows keep a gap that suits a die cutter. A
+**Link**/**Linked** toggle next to it locks the two axes to move
+together when you'd rather set one value for both.
+
+Once your sheet is ready, the **Display** page's Finish footer has two
+equal-weight buttons: **Save Deck** (or **Sign in to Save**, if you're
+not signed in) and **Print / Export →**, plus the existing **Export**
+dropdown for lightweight XML/card-image/decklist exports. Your project is
+also quietly backed up to this browser as you work — a small "Draft
+backed up locally" note under the buttons confirms it — and pressing
+**Print / Export →** while signed in with unsaved changes offers to save
+your deck first, since the print/PDF step can use a lot of your
+browser's memory and you don't want to lose your work if it struggles.
+
 ## Saving and re-using a project
 
 Local-folder and Google Drive options for coming back to a project
-later.
+later. If you're signed in and have saved decks already, the **Display**
+page's empty-project landing screen lists them directly so you can jump
+back into one without a trip to **My Decks** first.
 
 ## Saved decks, export, and the standalone decrypt tool