docs: dashboard v0.5.1 release notes

Co-authored-by: Alfonso [Magic Context] <288211368+alfonso-magic-context@users.noreply.github.com>

Author: ualtinok

.alfonso/release-notes/dashboard-v0.5.1.md

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+# Dashboard v0.5.1
+
+A small patch release.
+
+## What's Fixed
+
+- **No more console-window flashes on Windows.** Opening the dashboard spawned a child process for `git` (once per project while resolving identities) plus `opencode`/`pi` probes, each flashing a terminal window — easily a dozen or more on startup. All child spawns now use `CREATE_NO_WINDOW` on Windows (no-op on macOS/Linux). (#115)
+
+## What's New
+
+- **NVIDIA NIM support in Test Connection.** The embedding connection test now reads `input_type` / `truncate` from your config, so NIM endpoints can be validated from the dashboard. (#127)