Add custom db location and backup/restore functionality in Settings

[julyx10]

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[julyx10]

Branch: lap-custom-db — Custom DB Storage + Backup/Restore

Rust Backend

t_storage.rs (new, 526 lines)

• Extracted DB storage management, migration, and backup/restore logic from t_config.rs into a dedicated module
• Includes: DB_MIGRATION_GUARD, custom storage directory switching (change_db_storage_dir / reset_db_storage_dir), SQLite WAL checkpoint, and
  backup/restore pipeline
• Backup: Select libraries → checkpoint → create ZIP (backup-info.json metadata + app-config.json + individual .db files), Deflate compression
• Restore: Parse ZIP → detect name conflicts (auto-rename to Name (1)) → append as new libraries with fresh UUIDs, no existing data overwritten

t_config.rs

• Removed ~500 lines of migrated code; remove_library / get_library_info now delegate to t_storage::

t_cmds.rs

• Added 4 Tauri commands: get_db_storage_info, backup_databases, parse_backup_file, restore_databases
• Existing storage commands (get_db_storage_dir, change_db_storage_dir, etc.) now call t_storage::

Cargo.toml — Added zip crate (deflate-only, no unused features)

Vue Frontend

BackupDialog.vue (new)

• Multi-select libraries → estimated size → native save dialog → create ZIP
• Select-all toggle, loading states, success/error toasts

RestoreDialog.vue (new)

• Pick ZIP → parse & display library list ("New library" / "Will be renamed" badges) → select which to restore
• Loads existing library names from backend for conflict detection

Settings.vue

• Added backup/restore buttons in the storage section with hint text
• Registered BackupDialog and RestoreDialog
• ESC key closes dialogs in priority order (backup → restore → confirmation → window)
• Emits libraries-changed event after restore to notify Home view

ManageLibraries.vue — Emits updated after add/delete to keep the Home library dropdown in sync

configStore.js / main.js / Home.vue

• Cross-window library change notification via Pinia version counter + global event listener + watcher

i18n

All 9 locale files updated: storage section labels simplified, ~20 new backup/restore key-value pairs added.

Summary

• Verified on macOS. Windows considerations: sanitize_filename replaces illegal filename characters (:, *, etc.) for ZIP entry names — this keeps the
• restore consistent across platforms. Linux: native save/open dialogs should be tested. No platform-specific code was introduced.