Refactor view modules for improved readability and consistency

- Updated markdown rendering logic to use more concise methods for obtaining vector lengths.
- Changed review status display to use the correct flag from settings.
- Cleaned up sidebar rendering code for better formatting and readability.
- Enhanced status bar rendering with improved string formatting and consistent style application.
- Refined workflow panel rendering, ensuring consistent style usage and improved readability.
- Added architecture overview and detailed documentation for backend, data, dependencies, and frontend structures.

src/model/msglog/blobs.rs

@@ -1,8 +1,7 @@
 //! Binary blob storage in the message-log `SQLite` database (e.g. images,
 //! attachments), keyed by session id and an arbitrary blob key.
-
-use rusqlite::{Connection, params};
 use anyhow::Result;
+use rusqlite::{params, Connection};
 
 /// Insert or overwrite a blob for a session under `blob_key`.
 ///
@@ -10,7 +9,13 @@ use anyhow::Result;
 /// keyed on `(session_id, blob_key)`.
 ///
 /// Return: `Ok(())` on success, or the underlying `SQLite` error.
-pub fn store_blob(conn: &Connection, session_id: &str, blob_key: &str, data: &[u8], mime_type: Option<&str>) -> 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)",
@@ -23,7 +28,11 @@ pub fn store_blob(conn: &Connection, session_id: &str, blob_key: &str, data: &[u
 ///
 /// Return: `Ok(Some(data))` if found, `Ok(None)` if no matching row
 /// exists, `Err` for any other `SQLite` failure.
-pub fn retrieve_blob(conn: &Connection, session_id: &str, blob_key: &str) -> Result<Option<Vec<u8>>> {
+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],
@@ -36,30 +45,14 @@ pub fn retrieve_blob(conn: &Connection, session_id: &str, blob_key: &str) -> Res
     }
 }
 
-/// Delete a blob for a session by key.
-///
-/// Return: `Ok(true)` if a row was deleted, `Ok(false)` if no matching
-/// row existed.
-#[allow(dead_code)]
-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)
-}
-
 /// List all blob keys stored for a session, oldest first.
 ///
 /// Return: `Ok(Vec<String>)` of keys ordered by `created_at`, or the
 /// underlying `SQLite` error.
 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 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?);