feat(elasticsearch): add SQL-model execution with mapping-aware completion

- Route SELECT * FROM <index> through /_search for simple browses; aggregates/projections stay on /_sql
- Drive completion columns from /_mapping (flattened dotted fields, multi-fields)
- Switch editor completion to SQL when the active statement starts with SELECT/WITH on ES
- Skip generic SQL semantic diagnostics for ES (hyphenated wildcard indices caused 500s)
- Wire ES into server-side pagination plan; derive completion context from line blocks
- Fix result-grid pagination exceeding in-memory result sets (allRowsLoaded)

apps/desktop/src/components/grid/DataGrid.vue

@@ -1857,10 +1857,30 @@ const showTruncationWarning = computed(
   () => props.result.truncated === true && typeof props.pageLimit !== "number" && props.result.has_more !== true,
 );
 const isResultsContext = computed(() => props.context === "results");
-const displayedTotalRowCount = computed(() => props.totalRowCount ?? manualTotalRowCount.value);
+// affected_rows reported by the backend can be larger than the rows we
+// actually have in memory — e.g. ES auto-pages SELECT * on a big index and
+// reports the index's true match count. Surface that in the status bar so
+// the user sees the real total, but do NOT use it to unlock pagination:
+// we don't have those rows, so letting the user page into them would just
+// show blank screens.
+const inferredBackendTotalRowCount = computed(() => {
+  const affected = props.result.affected_rows;
+  if (typeof affected !== "number" || !Number.isFinite(affected)) return undefined;
+  if (affected <= props.result.rows.length) return undefined;
+  return affected;
+});
+const serverKnownTotalRowCount = computed(() => props.totalRowCount ?? manualTotalRowCount.value);
+const displayedTotalRowCount = computed(() => serverKnownTotalRowCount.value ?? inferredBackendTotalRowCount.value);
+// Only a server-confirmed total drives pagination — an inferred total means
+// rows exist that we never fetched, so navigation must stay inside rows.length.
 const hasKnownTotalRowCount = computed(
-  () => typeof displayedTotalRowCount.value === "number" && displayedTotalRowCount.value >= 0,
+  () => typeof serverKnownTotalRowCount.value === "number" && serverKnownTotalRowCount.value >= 0,
 );
+// When context=results and the caller hasn't configured server-side
+// pagination (no pageLimit), the backend handed us every row up-front and
+// rowCount IS the total. Without this hint, the "page is full → assume more"
+// fallback in canGoNextDataGridPage lets the user keep clicking next forever.
+const allRowsLoaded = computed(() => isResultsContext.value && props.pageLimit === undefined);
 const canGoNextPage = computed(() => {
   return canGoNextDataGridPage({
     hasMore: props.result.has_more,
@@ -1869,10 +1889,13 @@ const canGoNextPage = computed(() => {
     pageOffset: props.pageOffset,
     currentPage: currentPage.value,
     totalRowCount: hasKnownTotalRowCount.value ? displayedTotalRowCount.value : undefined,
+    allRowsLoaded: allRowsLoaded.value,
   });
 });
 const canJumpLastPage = computed(
-  () => canGoNextPage.value && (hasKnownTotalRowCount.value || !!props.tableMeta || !!props.countSql),
+  () =>
+    canGoNextPage.value &&
+    (hasKnownTotalRowCount.value || allRowsLoaded.value || !!props.tableMeta || !!props.countSql),
 );
 const totalRowCountBusy = computed(() => props.totalRowCountLoading === true || manualTotalRowCountLoading.value);
 const canCalculateTotalRowCount = computed(
@@ -2015,6 +2038,15 @@ async function lastPage() {
     emit("paginate", (lastPageNum - 1) * pageSize.value, pageSize.value, currentWhereInput(), currentOrderBy());
     return;
   }
+  if (allRowsLoaded.value) {
+    const total = props.result.rows.length;
+    if (total <= 0) return;
+    const lastPageNum = Math.ceil(total / pageSize.value);
+    if (lastPageNum <= currentPage.value) return;
+    currentPage.value = lastPageNum;
+    resetGridVerticalScroll(true);
+    return;
+  }
   if (!props.connectionId) return;
   const countTarget = await buildCurrentCountTarget();
   const sql = countTarget?.sql;