Add host mode and update sheet visibility model

- Add `using_host_mode` field to LocalConfig with getter/setter
- Replace `my_sheets`/`other_sheets` with
  `visible_sheets`/`invisible_sheets`
- Add `reference_sheets` set for host-owned sheets
- Add `shares_in_my_sheets` map to track external merge requests
- Update `use_sheet` to check `visible_sheets` instead of `my_sheets`

1 files changed, 16 insertions, 1 deletions

diff --git a/crates/vcs_data/src/data/local/config.rs b/crates/vcs_data/src/data/local/config.rs
index 28bd439..cfbc0d4 100644
--- a/crates/vcs_data/src/data/local/config.rs
+++ b/crates/vcs_data/src/data/local/config.rs
@@ -32,6 +32,10 @@ pub struct LocalConfig {
     /// This ID will be used to verify access permissions when connecting to the upstream server.
     using_account: MemberId,
 
+    /// Whether the current member is interacting as a host.
+    /// In host mode, full Vault operation permissions are available except for adding new content.
+    using_host_mode: bool,
+
     /// Whether the local workspace is stained.
     ///
     /// If stained, it can only set an upstream server with the same identifier.
@@ -52,6 +56,7 @@ impl Default for LocalConfig {
                 PORT,
             )),
             using_account: "unknown".to_string(),
+            using_host_mode: false,
             stained_uuid: None,
             sheet_in_use: None,
         }
@@ -81,6 +86,11 @@ impl LocalConfig {
         Ok(())
     }
 
+    /// Set the host mode
+    pub fn set_host_mode(&mut self, host_mode: bool) {
+        self.using_host_mode = host_mode;
+    }
+
     /// Set the currently used sheet
     pub async fn use_sheet(&mut self, sheet: SheetName) -> Result<(), std::io::Error> {
         let sheet = snake_case!(sheet);
@@ -110,7 +120,7 @@ impl LocalConfig {
         };
 
         // Check if the sheet exists
-        if !latest_info.my_sheets.contains(&sheet) {
+        if !latest_info.visible_sheets.contains(&sheet) {
             return Err(std::io::Error::new(
                 std::io::ErrorKind::NotFound,
                 "Sheet not found",
@@ -291,6 +301,11 @@ impl LocalConfig {
         self.using_account.clone()
     }
 
+    /// Check if the current member is interacting as a host.
+    pub fn is_host_mode(&self) -> bool {
+        self.using_host_mode
+    }
+
     /// Check if the local workspace is stained.
     pub fn stained(&self) -> bool {
         self.stained_uuid.is_some()