switch from pnpm patches to juspay/xterm.js fork (upstream #5818)

Replaces the minified-mjs pnpm patches from the previous commit with
a git-URL override pointing at the juspay/xterm.js fork. The fork's
`fix/dispose-leaks-built` branch commits both:

  1. The source-level .ts fix (upstream-ready; PR at xtermjs/xterm.js#5817,
     tracking issue xtermjs/xterm.js#5818).
  2. Pre-built .mjs bundles so pnpm can consume the fork directly
     without running xterm's build toolchain at install time.

Changes:

  - package.json: drop the two xterm patches from `patchedDependencies`;
    add `overrides` for `@xterm/xterm` and `@xterm/addon-webgl`
    pointing at `github:juspay/xterm.js#fix/dispose-leaks-built` (the
    addon-webgl entry uses `&path:/addons/addon-webgl` to select the
    monorepo subdirectory).
  - patches/: delete both @xterm patch files.
  - default.nix: bump the `fetchPnpmDeps` hash.
  - pnpm-lock.yaml: regenerated — pins the fork via its tarball URL
    + commit SHA, so the build is reproducible across machines.

Verified: `nix build .#default` succeeds end-to-end; dev-server heap
reproduction still shows `aliveDetached: 0, gced: 7/8` after 6 mode
toggles. Previous commit (the .mjs-patch approach) is preserved in
git history for record of the interim fix.

Once xtermjs/xterm.js#5817 merges + an xterm release ships, this
override can be dropped in favor of a plain version bump.

Author: srid

default.nix

@@ -46,7 +46,7 @@ let
     # hash-fresh` enforces this stays in sync with pnpm-lock.yaml by forcing
     # fetchPnpmDeps to re-execute (--rebuild), so stale artifacts in the
     # binary cache can't silently satisfy a hash that no longer matches.
-    hash = "sha256-oIcLBubUOtmUuWL3aQUcfMkv7sAAos5HhGvzB3OPYZQ=";
+    hash = "sha256-B+bX+aTMJScRbZC55ATPAnL8tJG5QAm6fkkABpTaljY=";
     fetcherVersion = 3;
   };
 

package.json

@@ -17,12 +17,12 @@
       "picomatch": "^4.0.4",
       "yaml": "^2.8.3",
       "defu": "^6.1.5",
-      "@anthropic-ai/sdk": "^0.81.0"
+      "@anthropic-ai/sdk": "^0.81.0",
+      "@xterm/xterm": "github:juspay/xterm.js#fix/dispose-leaks-built",
+      "@xterm/addon-webgl": "github:juspay/xterm.js#fix/dispose-leaks-built&path:/addons/addon-webgl"
     },
     "patchedDependencies": {
-      "node-pty@1.1.0": "patches/node-pty@1.1.0.patch",
-      "@xterm/xterm@6.0.0": "patches/@xterm__xterm@6.0.0.patch",
-      "@xterm/addon-webgl@0.19.0": "patches/@xterm__addon-webgl@0.19.0.patch"
+      "node-pty@1.1.0": "patches/node-pty@1.1.0.patch"
     }
   },
   "devDependencies": {