Fix fip function on zsh

[pkwagner]

The original fip shell function works fine on bash, but not on zsh:

❯ fip remote_host 8081    
Bad local forwarding specification '8081ocalhost:8081'

The reason for this is that zsh interprets the :l part of ssh -f -N -L "$port:localhost as modifier (lowercase), resulting in ssh -f -N -L "${port}ocalhost.

This PR resolves this by using proper ${} template variables, which work on both bash and zsh.

[Copilot]

✅ Ready to approve

The change is minimal, clearly addresses the described zsh expansion issue, and preserves behavior for bash.

Note: this review does not count toward required approvals for merging.

Pull request overview

This PR updates the fip/dip SSH port-forwarding shell functions to be compatible with zsh by bracing parameter expansions so zsh won’t treat :l (and similar) as a parameter expansion modifier.

Changes:

• Replace $port:localhost:$port-style expansions with ${port}:localhost:${port} to avoid zsh modifier parsing.
• Apply the same bracing fix to the pkill pattern used by dip.
• Minor consistency tweak: brace $1 when assigning host.

[!TIP]
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File summaries

File	Description
default/bash/fns/ssh-port-forwarding	Braces variable expansions in fip/dip to prevent zsh from mis-parsing :localhost and breaking ssh -L arguments.

Copilot's findings

• Files reviewed: 1/1 changed files
• Comments generated: 0

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