Implement chat and markdown views, enhance status bar, and add workflow panel

- Added `chat.rs` for rendering chat messages with timestamps and roles.
- Introduced `markdown.rs` for rendering markdown content with styling.
- Created `status.rs` to display the application status bar with session and message counts.
- Developed `workflow.rs` to show the current workflow status, including tool calls and active jobs.
- Established a `theme.rs` for centralized color management across the UI.
- Updated `mod.rs` to include new modules and manage rendering logic.

src/app/subagent/context.rs

@@ -0,0 +1,31 @@
+use std::path::PathBuf;
+use super::spawn::AgentDefinition;
+
+pub const REVIEWER_ALLOWED: &[&str] = &["read", "grep", "glob", "recall", "remember"];
+
+pub struct SubagentContext {
+    pub definition: AgentDefinition,
+    pub system_prompt: String,
+    pub allowed_tools: Vec<String>,
+    pub max_steps: usize,
+    pub session_dir: PathBuf,
+    pub origin: crate::app::state::types::Origin,
+}
+
+pub fn build_subagent_context(def: AgentDefinition) -> SubagentContext {
+    let allowed_tools = def.allowed_tools.clone().unwrap_or_else(|| {
+        if def.role == "reviewer" {
+            REVIEWER_ALLOWED.iter().map(|s| s.to_string()).collect()
+        } else {
+            Vec::new()
+        }
+    });
+    SubagentContext {
+        definition: def,
+        system_prompt: String::new(),
+        allowed_tools,
+        max_steps: 25,
+        session_dir: PathBuf::new(),
+        origin: crate::app::state::types::Origin::SubAgent,
+    }
+}