fix: reload open buffer via checktime when server edits a file

[tamercuba]

Summary

• Refresh open neovim buffers after ECA server file edits

Problem

When a tool call edits a file on the server side, neovim kept showing stale content for already open buffers until manual :e or :checktime

Evidences

Before

After

#70

[Copilot]

🟡 Changes recommended

The new buffer-refresh behavior is user-visible but isn’t covered by a regression test in the existing sidebar test suite.

Once you've addressed the issues Copilot identified, you can request another Copilot review.

Pull request overview

This PR addresses eca-nvim issue #70 by ensuring Neovim buffers don’t remain stale after the ECA server applies an on-disk file edit that originates from within the same Neovim session (so no FocusGained/autoread autocmd would fire).

Changes:

• On toolCalled events with details.type == "fileChange", resolve details.path to an absolute path and call :checktime for the corresponding loaded buffer (if any).
• Continue appending the changed file’s basename to the tool-call summary text, now derived from the absolute path.

File summaries

File	Description
lua/eca/sidebar.lua	Refreshes already-loaded buffers via checktime when a server-confirmed tool call reports a file change, preventing stale buffer content.

Review details

• Files reviewed: 1/1 changed files
• Comments generated: 1
• Review effort level: Lite

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[Copilot]

🟢 Approval recommended

The change is scoped, directly addresses the reported issue, and is backed by targeted automated tests covering the key behavioral cases.

Review details

• Files reviewed: 2/2 changed files
• Comments generated: 0 new
• Review effort level: Lite

[tamercuba]

@joaopluigi Im aware of the eca-nvim refactor, but IMO this is a fast-to-ship and simple feature that will improve a lot the user experience of eca-nvim :)