content: find-replace rewrites all text-bearing fields (756/756)

fr-rewrite dispatches per block type so image alt, list items, and table
headers/cells are renamed alongside text/heading/code/quote/callout —
matching exactly the set asText/stats/word-count fold into prose. Prior
find-replace skipped them, so a rename stayed visible in counts/exports.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

lib/content/tests/find-replace.sx

@@ -1,9 +1,10 @@
-;; Extension — global find/replace across text-bearing blocks.
+;; Extension — global find/replace across every text-bearing field.
 
 (st-bootstrap-classes!)
 (content/bootstrap!)
 (content-bootstrap-section!)
 (content-bootstrap-callout!)
+(content-bootstrap-table!)
 
 (define
   d
@@ -31,11 +32,12 @@
   (str (blk-send (doc-deep-find r "n") "text"))
   "nested Bar")
 
-;; ── does NOT touch image alt/src (not a text field) ──
+;; ── image alt IS a text field (asText ^ alt), so it is rewritten ──
 (content-test
-  "image alt untouched"
+  "image alt replaced"
   (str (blk-send (doc-deep-find r "img") "alt"))
-  "Foo alt")
+  "Bar alt")
+;; ── but src is a URL, not prose, so it stays put ──
 (content-test
   "image src untouched"
   (str (blk-send (doc-deep-find r "img") "src"))
@@ -77,7 +79,7 @@
   (str (blk-send (doc-find r2 "q") "text"))
   "new saying")
 
-;; ── callout text is now covered (consistency with asText/stats/summary) ──
+;; ── callout text is covered (consistency with asText/stats/summary) ──
 (content-test
   "replace callout text"
   (str
@@ -103,6 +105,42 @@
       "kind"))
   "note")
 
+;; ── list items are rewritten (asText folds items) ──
+(define
+  rl
+  (content/find-replace
+    (doc-append
+      (doc-empty "d")
+      (mk-list "l" false (list "Foo one" "two Foo")))
+    "Foo"
+    "Bar"))
+(content-test
+  "replace first list item"
+  (str (first (blk-send (doc-find rl "l") "items")))
+  "Bar one")
+(content-test
+  "replace second list item"
+  (str (first (rest (blk-send (doc-find rl "l") "items"))))
+  "two Bar")
+
+;; ── table headers + cells are rewritten (asText folds rows) ──
+(define
+  rt
+  (content/find-replace
+    (doc-append
+      (doc-empty "d")
+      (mk-table "t" (list "Foo head") (list (list "a Foo" "b"))))
+    "Foo"
+    "Bar"))
+(content-test
+  "replace table header"
+  (str (first (table-headers (doc-find rt "t"))))
+  "Bar head")
+(content-test
+  "replace table cell"
+  (str (first (first (table-rows (doc-find rt "t")))))
+  "a Bar")
+
 ;; ── no match → unchanged render ──
 (content-test
   "no match"