Add Dataview and Bases generators (Toolbox Phase 2)

Two more inside-LMS generators under /tools, completing the 6-tool set:
- Dataview: DQL builder (TABLE/LIST/TASK/CALENDAR, FROM/WHERE/SORT/LIMIT),
  output wrapped in a dataview code block
- Bases: .base YAML builder (views, filters and:, order, sort, groupBy, limit);
  filter expressions emitted as single-quoted YAML scalars for safety

Syntax verified against official Obsidian docs (research workflow). Audit fix:
Bases sort entries use 'column:' (not 'property:') per documented working .base
files; 'property:' is kept only for groupBy. 14 new tests (47 total).

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

src/app/(student)/tools/dataview/page.tsx

@@ -0,0 +1,15 @@
+import { DataviewForm } from "./DataviewForm";
+
+export const metadata = { title: "Генератор Dataview — Obsidian Toolbox" };
+
+export default function DataviewToolPage() {
+  return (
+    <main className="mx-auto w-full max-w-5xl px-6 py-8">
+      <h1 className="text-2xl font-bold tracking-wide" style={{ color: "var(--foreground)" }}>Генератор Dataview</h1>
+      <p className="mt-1 text-sm" style={{ color: "var(--muted-foreground)" }}>Запросы DQL: таблицы, списки, задачи и календарь по заметкам.</p>
+      <div className="mt-6 card-aubade p-4">
+        <DataviewForm />
+      </div>
+    </main>
+  );
+}