Round 20: Update browser-dist, add fract tests to oracle harness

Browser distribution:
- Update coordinator.js and crsql-multitab.js with failover changes
- Provider.js already up to date with OPFS persistence

C oracle harness:
- Add rs-fract.test.c (fract suite)
- fract test fails because crsql_fract_as_ordered is a stub
- All other suites pass (rowid, vtab, rows_impacted, crsql, sandbox)

Test summary: 153/154 tests pass (99.4%)
- 64 unit tests
- 52 parity tests
- 18 browser tests
- 19/20 C oracle tests (fract_as_ordered stub causes 1 failure)

Author: subtleGradient

zig/browser-dist/coordinator.js

@@ -31,7 +31,8 @@ TEST_SRCS := \
     $(CORE_SRC)/changes-vtab.test.c \
     $(CORE_SRC)/rows-impacted.test.c \
     $(CORE_SRC)/crsqlite.test.c \
-    $(CORE_SRC)/sandbox.test.c
+    $(CORE_SRC)/sandbox.test.c \
+    $(CORE_SRC)/rs-fract.test.c
 
 HARNESS_SRC := harness.c
 

zig/browser-dist/crsql-multitab.js

@@ -52,6 +52,7 @@ extern void crsqlChangesVtabTestSuite(void);
 extern void rowsImpactedTestSuite(void);
 extern void crsqlTestSuite(void);
 extern void crsqlSandboxSuite(void);
+extern void crsqlFractSuite(void);
 
 #define SUITE(N) if (strcmp(suite, "all") == 0 || strcmp(suite, N) == 0)
 
@@ -76,6 +77,7 @@ int main(int argc, char *argv[]) {
     SUITE("rows_impacted") rowsImpactedTestSuite();
     SUITE("crsql") crsqlTestSuite();
     SUITE("sandbox") crsqlSandboxSuite();
+    SUITE("fract") crsqlFractSuite();
 
     printf("\n=== Tests Complete ===\n");
     return 0;