Settings/keymap backup path next to files + update notification messages (#24517)

Before:


![image](https://github.com/user-attachments/assets/5b7d8677-b0db-4a66-ac30-e4751ba4182d)

After:


![image](https://github.com/user-attachments/assets/94743bc2-2902-43a3-8d6e-e0e0e6e469ec)

Release Notes:

- N/A

crates/paths/src/paths.rs

@@ -145,12 +145,24 @@ pub fn settings_file() -> &'static PathBuf {
     SETTINGS_FILE.get_or_init(|| config_dir().join("settings.json"))
 }
 
+/// Returns the path to the `settings_backup.json` file.
+pub fn settings_backup_file() -> &'static PathBuf {
+    static SETTINGS_FILE: OnceLock<PathBuf> = OnceLock::new();
+    SETTINGS_FILE.get_or_init(|| config_dir().join("settings_backup.json"))
+}
+
 /// Returns the path to the `keymap.json` file.
 pub fn keymap_file() -> &'static PathBuf {
     static KEYMAP_FILE: OnceLock<PathBuf> = OnceLock::new();
     KEYMAP_FILE.get_or_init(|| config_dir().join("keymap.json"))
 }
 
+/// Returns the path to the `keymap_backup.json` file.
+pub fn keymap_backup_file() -> &'static PathBuf {
+    static KEYMAP_FILE: OnceLock<PathBuf> = OnceLock::new();
+    KEYMAP_FILE.get_or_init(|| config_dir().join("keymap_backup.json"))
+}
+
 /// Returns the path to the `tasks.json` file.
 pub fn tasks_file() -> &'static PathBuf {
     static TASKS_FILE: OnceLock<PathBuf> = OnceLock::new();