feat: the story thread looks like a track on a circuit board

Owner: the direction is right, but a smooth line is not developer style;
everything else on the site is binary. The thread is now a trace: straight
runs with 45 degree bends, solder points where it bends or meets a figure, a
second fainter track beside it, figures as components (pins on the
rectangular ones, the chapter number in binary inside), and a bit that flips
between 1 and 0 as it travels at the head.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

CLAUDE.md

@@ -65,9 +65,10 @@ App lives in `apps/web`. Social media videos live in `apps/video` (Remotion, sta
   `data-glow` surfaces). Reuse them instead of inventing new effects.
 - The homepage is one story with a visible thread (`apps/web/src/components/story/`). Every chapter opens
   with one sentence from `story` in the content files; read one after the other they tell the way of a
-  project from the idea to the first email. `StoryThread` is one line down the whole page that draws itself
-  as the visitor scrolls: under each sentence it crosses the page, stands a figure on the line and continues
-  on the other side, with a glowing dot at its head. `Block` prop `chapter` gives a section its sentence and
+  project from the idea to the first email. `StoryThread` is one trace down the whole page, in the look of a circuit
+  board (45 degree bends, solder points, a second parallel track), that draws itself as the visitor scrolls:
+  under each sentence it crosses the page, stands a component with the chapter number in binary on the track
+  and continues on the other side, with a bit (1/0) travelling at its head. `Block` prop `chapter` gives a section its sentence and
   figure; how much of the line is drawn is decided in `src/domain/thread.ts`. A new section on the homepage
   needs a sentence that continues the story, or it breaks the thread. No rails, no "next question" links
   (owner rejected both).