Tables: add the missing Resize Table button (#935)

table.resize has existed in the engine since #589/#1706 (overlap checks, tests), and the
command catalog already promised it under Table Design > Properties, but no ribbon button ever
called it -- the only way to resize a table was scripting the command directly (control channel,
CLI, MCP). #935 (no drag handle) assumed this menu path worked; it doesn't.

Adds a "Resize Table" button next to the Table Name field (same Properties group the catalog
already declares), opening a small dialog pre-filled with the table's current range. Confirming
runs table.resize with the typed range, same validation as #589/#1706 (rejects overlap with
another table, matching Excel's "A table can't overlap another table.").

The drag-handle part of #935 is unaddressed; this only restores the menu/dialog path.

Verified manually: created two tables, used the new button to grow one onto the other (rejected),
then to an adjacent non-overlapping range (accepted, table intact).

crates/ui-egui/src/dialogs.rs

@@ -562,6 +562,24 @@ impl Dialog {
                     defaults,
                 )
             }
+            "tableResize" => {
+                let (table, range) = app
+                    .session
+                    .active()
+                    .and_then(|d| {
+                        let sh = d.wb.active()?;
+                        let t = sh.table_at(d.selection.active)?;
+                        Some((t.name.clone(), t.range.a1()))
+                    })
+                    .unwrap_or_default();
+                Dialog::form(
+                    "tableResize",
+                    "Resize Table",
+                    "table.resize",
+                    vec![Text { key: "range", label: "New range for the table:" }],
+                    json!({"table": table, "range": range}),
+                )
+            }
             "dataValidation" => Dialog::form(
                 "dataValidation",
                 "Data Validation",

crates/ui-egui/src/ribbon.rs

@@ -2282,6 +2282,11 @@ fn table_design(app: &mut SheetApp, ui: &mut Ui) {
             act(app, "table.rename", json!({"table": tname, "name": name}));
         }
     });
+    let __k = big_button(ui, Icon::Table, "Resize\nTable", "Resize Table", false);
+    control_keytip(app, ui, &__k, "dialog:tableResize");
+    if __k.clicked() {
+        app.open_dialog("tableResize", json!({}));
+    }
     sep(ui);
     let __k = big_button(ui, Icon::Duplicates, "Remove\nDuplicates", "Remove Duplicates", false);
     control_keytip(app, ui, &__k, "data.removeDuplicates");