fix: add HOME environment variable to lxc_exec and improve fzf installation test

tests/test_tasks.py

@@ -4,7 +4,7 @@ import subprocess
 def lxc_exec(container: str, cmd: str, check: bool = True) -> subprocess.CompletedProcess:
     """Run a command in the container as the jev user."""
     return subprocess.run(
-        ["lxc", "exec", container, "--user", "1000", "--", "bash", "-lc", cmd],
+        ["lxc", "exec", container, "--user", "1000", "--env", "HOME=/home/jev", "--", "bash", "-lc", cmd],
         check=check,
     )
 
@@ -34,9 +34,10 @@ def test_install_uv(container: str) -> None:
 
 def test_install_fzf(container: str) -> None:
     run_task(container, "install_fzf")
-    for binary in ["fzf", "batcat"]:
-        result = lxc_exec(container, f"which {binary}", check=False)
-        assert result.returncode == 0, f"{binary!r} not found after install_fzf"
+    result = lxc_exec(container, "test -f ~/.fzf/bin/fzf", check=False)
+    assert result.returncode == 0, "fzf binary not found at ~/.fzf/bin/fzf after install_fzf"
+    result = lxc_exec(container, "which batcat", check=False)
+    assert result.returncode == 0, "batcat not found after install_fzf"
 
 
 def test_install_zoxide(container: str) -> None: