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/bgbash/control.rs

@@ -0,0 +1,38 @@
+use std::collections::HashMap;
+use std::sync::Mutex;
+use std::sync::OnceLock;
+
+use super::job::BashJob;
+
+pub(crate) fn bash_jobs_map() -> &'static Mutex<HashMap<String, BashJob>> {
+    static JOBS: OnceLock<Mutex<HashMap<String, BashJob>>> = OnceLock::new();
+    JOBS.get_or_init(|| Mutex::new(HashMap::new()))
+}
+
+pub fn bash_output(id: &str) -> Option<Vec<String>> {
+    let mut map = bash_jobs_map().lock().ok()?;
+    let job = map.get_mut(id)?;
+    let mut lines = Vec::new();
+    while let Some(line) = job.try_read_line() {
+        lines.push(line);
+    }
+    if lines.is_empty() { None } else { Some(lines) }
+}
+
+pub fn bash_kill(id: &str) -> anyhow::Result<()> {
+    let mut map = bash_jobs_map().lock().map_err(|e| anyhow::anyhow!("lock error: {}", e))?;
+    let job = map.remove(id);
+    if job.is_some() {
+        Ok(())
+    } else {
+        anyhow::bail!("bash job '{}' not found", id)
+    }
+}
+
+pub fn register_bash_job(job: BashJob) -> String {
+    let id = job.id.clone();
+    if let Ok(mut map) = bash_jobs_map().lock() {
+        map.insert(id.clone(), job);
+    }
+    id
+}