docs: dashboard v0.8.3 release notes

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

Author: ualtinok

.alfonso/release-notes/dashboard-v0.8.3.md

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+# Dashboard v0.8.3
+
+## Fixes
+
+- **OpenCode model dropdowns no longer hide your configured providers.** Model discovery briefly used `opencode --pure models`, which skips external plugins and so omitted providers registered by auth plugins (e.g. `anthropic`, `google`). The pickers now use the full `opencode models` list, restoring every provider you have set up.
+- **Wider model pickers.** The model selectors (and the "Add fallback model" dropdown in particular) were cramped and wrapped their options. They now fill the column.
+- **Cleaner Cache Diagnostics.** Removed the combined "Show all" view: the page always focuses a single session's cache timeline instead of merging every session into one chart, which made the numbers confusing. A session is always selected; clicking a card focuses it.
+
+## Maintenance
+
+- Updated the Tauri stack to the latest 2.x and refreshed dependencies, resolving several security advisories.