Accounts, Contacts and Sidebar specs: follow the current table layout, run them

The three suites were skipped since the table rework. What changed under them:

- An account or contact spans three rows (main, total balance, details),
  marked from isFirst; the helpers paired rows by two and filtered on a
  row class the rows no longer carry. A collapsed details row is hidden,
  so rows are read including hidden ones.
- Accounts render one table per account group; the page object reads the
  rows of every group table in order, and the sorting fixture keeps its
  three accounts in one group, since sorting applies within a group.
- The expand toggle is the row's expand column, not a row-toggle element.
- useAccountInfo reads ownership from the keyring context, which the test
  page did not provide, so saving a name did nothing; the page now renders
  the real KeyringCtxRoot. The mock api gains consts.system.ss58Prefix.
- Badge popups (react-tooltip v6) render only while hovered; the specs
  hover the badge first. The multisig badge needs the isMultisig flag.
- Addresses are shown in full and shortened by css; the fixtures with
  shortened addresses are gone.
- The total balance, transferable and locked cards are always shown, as
  placeholders without accounts; the specs check that instead of their
  absence.
- Checks that needed matchers the runner lacks (not.toHaveLength,
  toHaveProperty, toThrow with a contained message) are written against
  the DOM directly.

packages/test-support/src/utils/domAssertions.ts

@@ -24,6 +24,16 @@ export function assertHasClass (node: Node | null, className: string): void {
   assert.ok(classList.contains(className), `Expected class "${className}" on ${describeElement(node)}`);
 }
 
+/** As not.toHaveClass: the element is there, without the class */
+export function assertNotHasClass (node: Node | null, className: string): void {
+  assert.ok(node, `Expected an element without class "${className}", found none`);
+
+  const classList = (node as Partial<Element>).classList;
+
+  assert.ok(classList, `Expected an element without class "${className}", found ${describeElement(node)}`);
+  assert.ok(!classList.contains(className), `Expected no class "${className}" on ${describeElement(node)}`);
+}
+
 /** As toHaveTextContent: the whitespace-normalized text contains the string, or matches the pattern */
 export function assertTextContent (element: Node | null, expected: string | RegExp): void {
   assert.ok(element, `Expected an element with text ${String(expected)}, found none`);