feat(settings): add configurable model selection

- Add Model settings section with free-text input for model override
- Pass configured model through to SDK query() calls
- Display active model badge in ActionBar next to token usage
- Seed model state from DB on mount, update from system:init events
- Empty/unset value uses SDK default (no breaking change)

1 files changed, 4 insertions, 0 deletions

diff --git a/src/main/claude/index.ts b/src/main/claude/index.ts
index 30a0f57..7867a9f 100644
--- a/src/main/claude/index.ts
+++ b/src/main/claude/index.ts
@@ -48,6 +48,9 @@ export async function sendMessage({
   // Load any custom system prompt for this phase (null → use default)
   const customSystemPrompt = getSetting(`systemPrompt.${session.phase}`) ?? undefined;
 
+  // Load global model override (empty string or null → let SDK use its default)
+  const configuredModel = getSetting("model") || undefined;
+
   const phaseConfig = getPhaseConfig(
     session.phase as Phase,
     sessionDir,
@@ -59,6 +62,7 @@ export async function sendMessage({
     prompt: message,
     options: {
       cwd: project.path,
+      model: configuredModel,
       resume: session.claude_session_id ?? undefined,
       tools: phaseConfig.tools,
       permissionMode: phaseConfig.permissionMode,