Phase 5 cleanup: remove legacy HTML components, fix nav-tree fragment

- Remove old raw! layout components (~app-head, ~app-layout, ~oob-response,
  ~header-row, ~menu-row, ~oob-header, ~header-child) from layout.sexp
- Convert nav-tree fragment from Jinja HTML to sexp source, fixing the
  "Unexpected character: ." parse error caused by HTML leaking into sexp
- Add _as_sexp() helper to safely coerce HTML fragments to ~rich-text
- Fix federation/sexp/search.sexpr extra closing paren
- Remove dead _html() wrappers from blog and account sexp_components
- Remove stale render import from cart sexp_components
- Add dev_watcher.py to auto-reload on .sexp/.sexpr/.js/.css changes
- Add test_parse_all.py to parse-check all 59 sexpr/sexp files
- Fix test assertions for sx- attribute prefix (was hx-)
- Add sexp.js version logging for cache debugging

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

blog/sexp/sexp_components.py

@@ -387,10 +387,6 @@ def _page_card_sexp(page: dict, ctx: dict) -> str:
         excerpt=excerpt,
     )
 
-def _page_card_html(page: dict, ctx: dict) -> str:
-    """Single page card (HTML, kept for backwards compat)."""
-    return _page_card_sexp(page, ctx)
-
 
 def _view_toggle_sexp(ctx: dict) -> str:
     """View toggle bar (list/tile) for desktop."""
@@ -547,10 +543,6 @@ def _action_buttons_sexp(ctx: dict) -> str:
         inner=SexpExpr(inner) if inner else None,
     )
 
-def _action_buttons_html(ctx: dict) -> str:
-    """New Post/Page + Drafts toggle buttons (HTML, kept for backwards compat)."""
-    return _action_buttons_sexp(ctx)
-
 
 def _tag_groups_filter_sexp(ctx: dict) -> str:
     """Tag group filter bar as sexp."""
@@ -591,10 +583,6 @@ def _tag_groups_filter_sexp(ctx: dict) -> str:
     items = "(<> " + " ".join(li_parts) + ")"
     return sexp_call("blog-filter-nav", items=SexpExpr(items))
 
-def _tag_groups_filter_html(ctx: dict) -> str:
-    """Tag group filter bar (HTML, kept for backwards compat)."""
-    return _tag_groups_filter_sexp(ctx)
-
 
 def _authors_filter_sexp(ctx: dict) -> str:
     """Author filter bar as sexp."""
@@ -628,10 +616,6 @@ def _authors_filter_sexp(ctx: dict) -> str:
     items = "(<> " + " ".join(li_parts) + ")"
     return sexp_call("blog-filter-nav", items=SexpExpr(items))
 
-def _authors_filter_html(ctx: dict) -> str:
-    """Author filter bar (HTML, kept for backwards compat)."""
-    return _authors_filter_sexp(ctx)
-
 
 def _tag_groups_filter_summary_sexp(ctx: dict) -> str:
     """Mobile filter summary for tag groups (sexp)."""
@@ -649,9 +633,6 @@ def _tag_groups_filter_summary_sexp(ctx: dict) -> str:
         return ""
     return sexp_call("blog-filter-summary", text=", ".join(names))
 
-def _tag_groups_filter_summary_html(ctx: dict) -> str:
-    """Mobile filter summary for tag groups (HTML, kept for backwards compat)."""
-    return _tag_groups_filter_summary_sexp(ctx)
 
 
 def _authors_filter_summary_sexp(ctx: dict) -> str:
@@ -670,9 +651,6 @@ def _authors_filter_summary_sexp(ctx: dict) -> str:
         return ""
     return sexp_call("blog-filter-summary", text=", ".join(names))
 
-def _authors_filter_summary_html(ctx: dict) -> str:
-    """Mobile filter summary for authors (HTML, kept for backwards compat)."""
-    return _authors_filter_summary_sexp(ctx)
 
 
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