fix(shell): launch shell tabs as an interactive login shell

Shell-mode sessions resolve to an absolute shell path (issue #208's
fix) but launch it bare, with no -i/-l flags. Without those, the
spawned shell runs as a non-interactive child of the non-interactive
`bash -c` that launches the pane, so it never sources ~/.zshrc or
~/.bashrc — silently dropping aliases, PATH additions, and tool init
(zoxide, nvm, etc.).

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

src/tmux-manager.ts

@@ -780,7 +780,11 @@ export function buildSpawnCommand(options: {
   // SERVER process's env — empty in containers and system systemd units, leaving
   // the pane command ending in a dangling `&&` ("syntax error: unexpected end of
   // file", pane dead on arrival). Resolve it in Node and quote the result.
-  return shellescape(resolveLocalShell());
+  // -i -l: interactive login shell, so the resolved shell sources the user's rc
+  // files (~/.zshrc, ~/.bashrc, etc.) instead of running as a bare non-interactive
+  // child of the non-interactive `bash -c` that launches the pane — without this,
+  // aliases, PATH additions, and tool init (zoxide, nvm, etc.) are silently dropped.
+  return `${shellescape(resolveLocalShell())} -i -l`;
 }
 
 /**