chore(ui): refactor workspace to monorepo (#70)

## Summary by Sourcery

Refactor the UI project structure into a pnpm monorepo packages layout
and align tooling and automation with the new paths.

Enhancements:
- Reorganize the UI app from the root ui directory into packages/ui
within a pnpm workspace.
- Update pnpm workspace configuration to include all packages under
packages/*.
- Adjust paths in changeset configuration so the @dropout/ui package
resolves from packages/ui.

Build:
- Update pre-commit configuration paths and arguments to reflect the new
UI location and normalize hook argument formatting.
- Update Dependabot configuration so npm updates target /packages/ui
instead of /ui.

CI:
- Update GitHub Actions workflows to watch packages/** instead of ui/**
and to run frontend tasks from packages/ui.
- Update pnpm cache dependency paths in workflows to use the root
pnpm-lock.yaml.
- Simplify frontend install steps in test workflows to run from the
repository root.

Chores:
- Add a new index.html under packages/ui and remove the old
ui/index.html to match the new project layout.

1 files changed, 0 insertions, 78 deletions

diff --git a/ui/src/stores/game.svelte.ts b/ui/src/stores/game.svelte.ts
deleted file mode 100644
index 504d108..0000000
--- a/ui/src/stores/game.svelte.ts
+++ /dev/null
@@ -1,78 +0,0 @@
-import { invoke } from "@tauri-apps/api/core";
-import type { Version } from "../types";
-import { uiState } from "./ui.svelte";
-import { authState } from "./auth.svelte";
-import { instancesState } from "./instances.svelte";
-
-export class GameState {
-  versions = $state<Version[]>([]);
-  selectedVersion = $state("");
-
-  constructor() {
-    // Constructor intentionally empty
-    // Instance switching handled in App.svelte with $effect
-  }
-
-  get latestRelease() {
-    return this.versions.find((v) => v.type === "release");
-  }
-
-  async loadVersions(instanceId?: string) {
-    const id = instanceId || instancesState.activeInstanceId;
-    if (!id) {
-      this.versions = [];
-      return;
-    }
-
-    try {
-      this.versions = await invoke<Version[]>("get_versions", {
-        instanceId: id,
-      });
-      // Don't auto-select version here - let BottomBar handle version selection
-      // based on installed versions only
-    } catch (e) {
-      console.error("Failed to fetch versions:", e);
-      uiState.setStatus("Error fetching versions: " + e);
-    }
-  }
-
-  async startGame() {
-    if (!authState.currentAccount) {
-      alert("Please login first!");
-      authState.openLoginModal();
-      return;
-    }
-
-    if (!this.selectedVersion) {
-      alert("Please select a version!");
-      return;
-    }
-
-    if (!instancesState.activeInstanceId) {
-      alert("Please select an instance first!");
-      uiState.setView("instances");
-      return;
-    }
-
-    uiState.setStatus("Preparing to launch " + this.selectedVersion + "...");
-    console.log(
-      "Invoking start_game for version:",
-      this.selectedVersion,
-      "instance:",
-      instancesState.activeInstanceId,
-    );
-    try {
-      const msg = await invoke<string>("start_game", {
-        instanceId: instancesState.activeInstanceId,
-        versionId: this.selectedVersion,
-      });
-      console.log("Response:", msg);
-      uiState.setStatus(msg);
-    } catch (e) {
-      console.error(e);
-      uiState.setStatus("Error: " + e);
-    }
-  }
-}
-
-export const gameState = new GameState();