style(dm): redesign dashboard with purple-gold theme

Redesign DM Dashboard (/dm/, /ru/dm/) with purple-gold theme (#534AB7 + #c8a84b):

Design System:
- Update dm-theme.css with 49 purple-gold tokens (transitions, shadows, hover states)
- Create DmTabs.astro with ARIA, keyboard nav, URL hash sync, localStorage persistence
- Create DmSidebar.astro for desktop navigation
- Redesign DmHeader with gold accent
- Update DmButton, DmCard, DmInput primitives
- Expand i18n to 47 strings

Layout:
- Redesign DmLayout with 3-column dashboard grid (sidebar|main|context)
- Update /dm/index.astro and /ru/dm/index.astro with named slots

Feature Components:
- DiceRoller: empty state, ARIA live, color-coded history, storage key fallback
- InitiativeTracker: HP editing, active highlighting, storage key fallback
- Open5eReference: skeletons, debounce, error retry, gold tabs
- NotesPanel: cross-tab sync, copy-to-clipboard, auto-save
- AuthPanel: VK/Yandex brand colors, pill buttons

Tests:
- Add 50 Playwright E2E tests (smoke, dice, initiative, reference, notes, data-migration)

Fixes:
- Document Open5e client.ts URL bugfix
- Add backward-compatible storage key fallback for dice/initiative
- Preserve legacy sessionStorage data on load

tests/dm/initiative.spec.ts

@@ -0,0 +1,62 @@
+import { test, expect } from "@playwright/test";
+
+test.describe("Initiative Tracker", () => {
+  test.beforeEach(async ({ page }) => {
+    await page.goto("/dm/#initiative");
+  });
+
+  test("add combatant with auto-roll", async ({ page }) => {
+    await page.fill("[data-testid='init-name-input']", "Гоблин");
+    await page.fill("[data-testid='init-mod-input']", "2");
+    await page.click("[data-testid='init-add-btn']");
+    await expect(page.locator("[data-testid='init-combatant']")).toBeVisible();
+    await expect(page.locator("[data-testid='init-combatant-name']")).toContainText("Гоблин");
+  });
+
+  test("sort by initiative descending", async ({ page }) => {
+    await page.fill("[data-testid='init-name-input']", "А");
+    await page.fill("[data-testid='init-mod-input']", "5");
+    await page.fill("[data-testid='init-initiative-input']", "25");
+    await page.click("[data-testid='init-add-btn']");
+
+    await page.fill("[data-testid='init-name-input']", "Б");
+    await page.fill("[data-testid='init-mod-input']", "0");
+    await page.fill("[data-testid='init-initiative-input']", "10");
+    await page.click("[data-testid='init-add-btn']");
+
+    const scores = await page.locator("[data-testid='init-score']").allTextContents();
+    expect(Number(scores[0])).toBeGreaterThan(Number(scores[1]));
+  });
+
+  test("next turn cycles active combatant", async ({ page }) => {
+    await page.fill("[data-testid='init-name-input']", "Гоблин");
+    await page.fill("[data-testid='init-mod-input']", "2");
+    await page.fill("[data-testid='init-initiative-input']", "20");
+    await page.click("[data-testid='init-add-btn']");
+
+    await page.fill("[data-testid='init-name-input']", "Орк");
+    await page.fill("[data-testid='init-mod-input']", "0");
+    await page.fill("[data-testid='init-initiative-input']", "15");
+    await page.click("[data-testid='init-add-btn']");
+
+    const firstActive = await page.locator("[data-testid='init-combatant'].active").textContent();
+    await page.click("[data-testid='init-next-btn']");
+    const secondActive = await page.locator("[data-testid='init-combatant'].active").textContent();
+    expect(firstActive).not.toBe(secondActive);
+  });
+
+  test("delete combatant", async ({ page }) => {
+    await page.fill("[data-testid='init-name-input']", "Гоблин");
+    await page.fill("[data-testid='init-mod-input']", "2");
+    await page.fill("[data-testid='init-initiative-input']", "20");
+    await page.click("[data-testid='init-add-btn']");
+
+    await page.click("[data-testid='init-delete-btn']");
+    await expect(page.locator("[data-testid='init-empty-state']")).toBeVisible();
+  });
+
+  test("mobile viewport renders correctly", async ({ page }) => {
+    await page.setViewportSize({ width: 375, height: 812 });
+    await expect(page.locator("[data-testid='init-section']")).toBeVisible();
+  });
+});