Switch from pnpm to Bun; install Rust through mise; update Tauri packages on both sides

mise.toml

@@ -1,22 +1,23 @@
 [tools]
 node = "24"
-pnpm = "11"
+bun = "1.4"
+rust = "1.98.1"
 
 [tasks.dev]
 description = "Run the app in development mode. Pass a repo path: mise run dev /path/to/repo"
-run = "pnpm tauri dev -- --"
+run = "bun run tauri dev -- --"
 
 [tasks.test]
 description = "Run unit tests"
-run = "pnpm vitest run"
+run = "bun run vitest run"
 
 [tasks.check]
 description = "Type-check the frontend and the Rust code"
-run = ["pnpm vue-tsc --noEmit", "cargo check --manifest-path src-tauri/Cargo.toml"]
+run = ["bun run vue-tsc --noEmit", "cargo check --manifest-path src-tauri/Cargo.toml"]
 
 [tasks.install]
 description = "Build a release binary and install it as ~/.local/bin/gites"
 run = [
-  "pnpm tauri build --no-bundle",
+  "bun run tauri build --no-bundle",
   "install -Dm755 src-tauri/target/release/gites ~/.local/bin/gites",
 ]