Stage three: spells fly through your own eyes

The reel's first-person mode now shows the fight, not just the rooms.
The board flourishes' event map is recast into world space (fx3d):
fireballs, bolts, and thrown things streak caster to target as glowing
billboards; landings swell and fade; blows that land on YOU wash the
screen red and jolt the camera; warp-steps and teleports flash violet;
a hurled body glides fast and straight with its eyes held steady. Nine
paintable conjuration sprites ship at public/fx3d (spec for the artist
in research/), shown in the token workshop beside the masonry.

Three rough edges sharpened along the way: sprites now project through
warp mouths under the same rigid motion the rays use, clipped by the
depth buffer to the opening; fire and warp surfaces pull a different
texture slice per world cell so a long blaze reads as one; and the
replay camera only turns toward an actor its eyes could actually see.

Two more gifts: the reel can record its first-person canvas straight
to a downloadable WebM (⏺ save video), and the About tab now shows
visitors the way into the three workshops.

One buried mine defused: rAF hands frame-start times that can precede
the tween's own clock, and a zero-length turn divided by it — one NaN
facing poisoned every ray black and re-triggered the camera effect
forever. The tween clamps and guards its phases now.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

packages/web/src/Help.svelte

@@ -147,6 +147,17 @@
             the edition currently in print</a>, and deal seven cards to
             somebody at a real table.
           </p>
+          <h3>Behind the curtain</h3>
+          <p>
+            The workshops where this table's pieces are made are open to
+            visitors:
+            the <a href="/?tokens">token workshop</a> shows every token in both
+            arts beside the wall textures and spell sprites;
+            the <a href="/?fx">flourish workshop</a> plays each board effect on
+            demand; and
+            the <a href="/?fpv">first-person workshop</a> walks the maze through
+            a wizard's own eyes (add <code>&demo=1</code> to watch a reel).
+          </p>
           <h3>Send word</h3>
           <p>
             Feedback, bug reports, and faint praise all welcome — ravens fly to