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/model/msglog/blobs.rs

@@ -0,0 +1,46 @@
+use rusqlite::{Connection, params};
+use anyhow::Result;
+
+pub fn store_blob(conn: &Connection, session_id: &str, blob_key: &str, data: &[u8], mime_type: Option<&str>) -> Result<()> {
+    let created_at = chrono::Utc::now().timestamp_millis();
+    conn.execute(
+        "INSERT OR REPLACE INTO blobs (session_id, blob_key, data, mime_type, created_at) VALUES (?1, ?2, ?3, ?4, ?5)",
+        params![session_id, blob_key, data, mime_type, created_at],
+    )?;
+    Ok(())
+}
+
+pub fn retrieve_blob(conn: &Connection, session_id: &str, blob_key: &str) -> Result<Option<Vec<u8>>> {
+    let result = conn.query_row(
+        "SELECT data FROM blobs WHERE session_id = ?1 AND blob_key = ?2",
+        params![session_id, blob_key],
+        |row| row.get(0),
+    );
+    match result {
+        Ok(data) => Ok(Some(data)),
+        Err(rusqlite::Error::QueryReturnedNoRows) => Ok(None),
+        Err(e) => Err(e.into()),
+    }
+}
+
+pub fn delete_blob(conn: &Connection, session_id: &str, blob_key: &str) -> Result<bool> {
+    let rows = conn.execute(
+        "DELETE FROM blobs WHERE session_id = ?1 AND blob_key = ?2",
+        params![session_id, blob_key],
+    )?;
+    Ok(rows > 0)
+}
+
+pub fn list_blob_keys(conn: &Connection, session_id: &str) -> Result<Vec<String>> {
+    let mut stmt = conn.prepare(
+        "SELECT blob_key FROM blobs WHERE session_id = ?1 ORDER BY created_at ASC"
+    )?;
+    let rows = stmt.query_map(params![session_id], |row| {
+        row.get::<_, String>(0)
+    })?;
+    let mut keys = Vec::new();
+    for row in rows {
+        keys.push(row?);
+    }
+    Ok(keys)
+}