build: manage pnpm with mise at latest

Replace the packageManager pin and .mise.toml (pnpm 12.3.4, node 26)
with mise.toml tracking pnpm latest; CI installs pnpm through mise
instead of an unpinned npm -g, keeping node from the runner image.

.gitea/workflows/build.yaml

@@ -18,8 +18,19 @@ jobs:
       - name: Checkout code
         uses: actions/checkout@v6
 
+      - name: Install mise
+        run: |
+          curl -fsSL https://mise.run | sh
+          echo "$HOME/.local/bin" >> "$GITHUB_PATH"
+
       - name: Install pnpm and TypeScript
-        run: npm install -g pnpm typescript@5.8.3
+        run: |
+          export PATH="$HOME/.local/bin:$PATH"
+          mise trust
+          mise install pnpm
+          mise reshim
+          echo "$HOME/.local/share/mise/shims" >> "$GITHUB_PATH"
+          npm install -g typescript@5.8.3
 
       - name: Install just
         run: |

.mise.toml

@@ -1,3 +0,0 @@
-[tools]
-node = "26"
-pnpm = "12.3.4"

mise.toml

@@ -0,0 +1,2 @@
+[tools]
+pnpm = "latest"

package.json

@@ -2,7 +2,6 @@
   "name": "aerospike",
   "version": "0.2.5",
   "description": "Simple, Opinionated Tiling Window Manager for Gnome written in Typescript",
-  "packageManager": "pnpm@12.3.4",
   "type": "module",
   "private": true,
   "repository": {