docs: dashboard v0.9.0 release notes

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

Author: ualtinok

.alfonso/release-notes/dashboard-v0.9.0.md

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+# Dashboard v0.9.0
+
+Adds a browser mode so the dashboard works on Linux and WSL2 setups where the desktop window comes up blank, and recognizes OpenCode Desktop installs that have no CLI.
+
+## Features
+
+- **Browser mode (`--serve`).** On some Linux distributions and under WSL2 the desktop window opens blank (often with `Could not create default EGL display`) because the bundled WebView cannot start against the host's graphics stack. The same binary can now run as a local web server instead: `magic-context-dashboard --serve` prints a URL (with a one-time access token) that you open in your normal browser, bypassing the embedded WebView entirely. It binds `127.0.0.1:9077` by default; `--serve <port>` changes the port, and `--host 0.0.0.0 --allow-remote` exposes it to other machines (off by default, behind an explicit flag, since the dashboard can read transcripts and edit config). See the [dashboard docs](https://docs.cortexkit.io/magic-context/reference/dashboard/#browser-mode---serve).
+
+## Fixes
+
+- **Recognizes OpenCode Desktop installs without a CLI (#196).** Installing OpenCode only through the Desktop app leaves no `opencode` binary to query, so model dropdowns came up empty with no explanation. The dashboard now detects a Desktop-only install and lets you type a model id manually, with a hint explaining why auto-population is unavailable. A stock CLI installed outside PATH is also found and used.
+
+## Maintenance
+
+- Pre-release hardening: `--serve` API responses are marked `no-store`, and Desktop detection has more robust path fallbacks when environment variables are unset.