treewide: better cross-device sync capabilities; in-database storage

Signed-off-by: NotAShelf <raf@notashelf.dev>
Change-Id: Id99798df6f7e4470caae8a193c2654aa6a6a6964

crates/pinakes-core/src/error.rs

@@ -57,6 +57,54 @@ pub enum PinakesError {
 
     #[error("external API error: {0}")]
     External(String),
+
+    // Managed Storage errors
+    #[error("managed storage not enabled")]
+    ManagedStorageDisabled,
+
+    #[error("upload too large: {0} bytes exceeds limit")]
+    UploadTooLarge(u64),
+
+    #[error("blob not found: {0}")]
+    BlobNotFound(String),
+
+    #[error("storage integrity error: {0}")]
+    StorageIntegrity(String),
+
+    // Sync errors
+    #[error("sync not enabled")]
+    SyncDisabled,
+
+    #[error("device not found: {0}")]
+    DeviceNotFound(String),
+
+    #[error("sync conflict: {0}")]
+    SyncConflict(String),
+
+    #[error("upload session expired: {0}")]
+    UploadSessionExpired(String),
+
+    #[error("upload session not found: {0}")]
+    UploadSessionNotFound(String),
+
+    #[error("chunk out of order: expected {expected}, got {actual}")]
+    ChunkOutOfOrder { expected: u64, actual: u64 },
+
+    // Sharing errors
+    #[error("share not found: {0}")]
+    ShareNotFound(String),
+
+    #[error("share expired: {0}")]
+    ShareExpired(String),
+
+    #[error("share password required")]
+    SharePasswordRequired,
+
+    #[error("share password invalid")]
+    SharePasswordInvalid,
+
+    #[error("insufficient share permissions")]
+    InsufficientSharePermissions,
 }
 
 impl From<rusqlite::Error> for PinakesError {