fix: expand openai-codex model catalog to match DEFAULT_CODEX_MODELS (#407)

* fix: expand openai-codex model catalog to match agent DEFAULT_CODEX_MODELS

The _PROVIDER_MODELS["openai-codex"] catalog only listed codex-mini-latest,
so the model dropdown for profiles using openai-codex provider (e.g. CodePath)
showed only that one entry — even when the profile's saved default_model was
gpt-5.4 or another standard Codex model.

Updated to match DEFAULT_CODEX_MODELS from hermes_cli/codex_models.py:
- gpt-5.4
- gpt-5.4-mini
- gpt-5.3-codex
- gpt-5.2-codex
- gpt-5.1-codex-max
- gpt-5.1-codex-mini
- codex-mini-latest (kept, relabeled as 'Codex Mini (latest)')

Also adds 2 regression tests: catalog includes gpt-5.4, display name correct.

* docs: v0.50.28 release — version badge and CHANGELOG

---------

Co-authored-by: Nathan Esquenazi <nesquena@gmail.com>

static/index.html

@@ -535,7 +535,7 @@
                 <div class="settings-section-title">System</div>
                 <div class="settings-section-meta">Instance version and access controls.</div>
               </div>
-              <span class="settings-version-badge">v0.50.27</span>
+              <span class="settings-version-badge">v0.50.28</span>
             </div>
             <div class="settings-field" style="border-top:1px solid var(--border);padding-top:12px;margin-top:8px">
               <label for="settingsPassword" data-i18n="settings_label_password">Access Password</label>