feat(redesign): design-system tokens, 23 Vue components, game-aware shell + Fleet/Solo dashboard

Tokens ported 1:1 from the Claude Design bundle (colors/game-themes/type/spacing/elevation/motion/fonts) with the data-theme/data-game theming contract via useThemeGame (+ cc-skin-swap repaint guard). 23 design-system components reimplemented as Vue SFCs (core/forms/data/navigation/feedback/brand). DashboardLayout rebuilt as the game-aware shell (GameSwitcher, grouped nav with permission gating preserved, agent-health footer, topbar). DashboardView: Fleet + Solo with per-game GAME_FIELDS rows and the themed ECharts PlayersChart; Solo wired to the real server store, Fleet on representative data pending the multi-instance backend. All four game skins (Rust/Dune/Conan/Soulmask). vue-tsc + vite build green.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

frontend/src/styles/tokens/motion.css

@@ -0,0 +1,27 @@
+/* ============================================================
+   Corrosion Control — Motion
+   Fast, mechanical, precise. No bounce on chrome. Subtle spring
+   reserved for "live" telemetry (pulses, meters). Respect
+   prefers-reduced-motion in components.
+   ============================================================ */
+
+:root {
+  --dur-instant: 80ms;  /* @kind other */
+  --dur-fast: 120ms;    /* @kind other */
+  --dur-base: 170ms;    /* @kind other */
+  --dur-slow: 240ms;    /* @kind other */
+  --dur-slower: 360ms;  /* @kind other */
+
+  /* Easings */
+  --ease-standard: cubic-bezier(0.2, 0, 0, 1);        /* @kind other */
+  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);          /* @kind other */
+  --ease-in: cubic-bezier(0.5, 0, 0.84, 0);           /* @kind other */
+  --ease-emphasized: cubic-bezier(0.34, 1.4, 0.5, 1); /* @kind other */
+
+  /* Common transition bundles */
+  --transition-colors: color var(--dur-fast) var(--ease-standard),
+    background-color var(--dur-fast) var(--ease-standard),
+    border-color var(--dur-fast) var(--ease-standard),
+    box-shadow var(--dur-fast) var(--ease-standard);
+  --transition-transform: transform var(--dur-base) var(--ease-out);
+}