Externalize sexp component templates and delete redundant HTML fragments

Move 24 defcomp definitions from Python string constants in components.py
to 7 grouped .sexp files under shared/sexp/templates/. Add load_sexp_dir()
to jinja_bridge.py for file-based loading. Migrate events and market
link-card fragment handlers from render_template to sexp. Delete 9
superseded Jinja HTML fragment templates.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

shared/sexp/jinja_bridge.py

@@ -20,6 +20,8 @@ Setup::
 
 from __future__ import annotations
 
+import glob
+import os
 from typing import Any
 
 from .types import NIL, Symbol
@@ -41,6 +43,13 @@ def get_component_env() -> dict[str, Any]:
     return _COMPONENT_ENV
 
 
+def load_sexp_dir(directory: str) -> None:
+    """Load all .sexp files from a directory and register components."""
+    for filepath in sorted(glob.glob(os.path.join(directory, "*.sexp"))):
+        with open(filepath, encoding="utf-8") as f:
+            register_components(f.read())
+
+
 def register_components(sexp_source: str) -> None:
     """Parse and evaluate s-expression component definitions into the
     shared environment.