auto_describe shows ''' in tab descriptions

[kordless]

Bug

Tab descriptions generated by auto_describe occasionally display trailing ''' or ``` characters, e.g. a tab showing "Running shell commands'''".

Cause

llama3.2 sometimes wraps its response in triple quotes or triple backticks. The raw Ollama response was taken as-is without stripping these wrappers (main.rs:150).

Fix

Already merged in commit d6c6924c — added trim_matches('\'') and trim_matches('')` after the initial trim on the Ollama response.

Steps to reproduce

1. Have llama3.2 loaded in Ollama
2. Trigger auto_describe on any pane
3. Observe tab description with ''' suffix (intermittent — depends on model output)