/load-session requires full path

[ErichBSchulz]

Issue

Version and model info

Aider v0.88.6.dev+less
Main model: gemini/gemini-2.5-pro with diff edit format
Weak model: gemini/gemini-2.5-flash-lite
Git repo: .git with 126 files
Repo-map: using 4096 tokens, auto refresh
Multiline mode: Enabled. Enter inserts newline, Alt-Enter
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