feat(#525): render reasoning.delta / reasoning.available stream (#543)

* feat(#525): add ReasoningDelta + ReasoningAvailable WsEvent types

* feat(#525): parse reasoning.delta + reasoning.available; route through reducer + StreamingState

* feat(#525): add reasoning streaming buffer to ChatStreamingController

* feat(#525): dispatch ReasoningDelta/ReasoningAvailable in ChatViewModel

* feat(#525): render collapsible ReasoningIndicator in chat list

* fix(#525): address review — icons+semantics, LocalHermesStatusColors, drop redundant ReasoningAvailable branch

* feat(#525): persist reasoningText on model, entity, mapper + Room migration 3->4

* feat(#525): reducer + streaming carry reasoningText onto message

* feat(#525): render persisted reasoning above each assistant bubble, drop global indicator

* nix: flake

* nix: flake

---------

Co-authored-by: M57 <m57@hermes-control.app>

app/src/main/res/values/strings.xml

@@ -104,6 +104,9 @@
     <string name="chat_status_auth_expired">Session expired \u2014 please sign in again</string>
     <string name="chat_thinking">Thinking\u2026</string>
     <string name="chat_thinking_param">Thinking: %1$s\u2026</string>
+    <string name="chat_reasoning">Reasoning</string>
+    <string name="chat_reasoning_expand">Expand reasoning</string>
+    <string name="chat_reasoning_collapse">Collapse reasoning</string>
     <string name="chat_input_placeholder_not_connected">Not connected\u2026</string>
     <string name="chat_input_placeholder_waiting">Waiting for response\u2026</string>
     <string name="chat_input_placeholder_type_message">Type a message\u2026</string>