feat(knowledge-lookup): restore panel navigation

Persist the active vault folder and selected entry across panel opens, and render the bar widget as an icon only.

.local/share/noctalia/plugins/knowledge-lookup/panel.luau

@@ -28,6 +28,7 @@ local cutKind: string? = nil
 local deleteRelative: string? = nil
 local operationError: string? = nil
 local searchMode = false
+local pendingNavigation: { vaultPath: string, currentDir: string, selectedRelative: string }? = nil
 local loading = false
 local loadError: string? = nil
 local render: () -> ()
@@ -231,6 +232,54 @@ local function selectedEntry(): any?
   return visible[selected]
 end
 
+local function navigationStatePath(): string?
+  local dataDir = noctalia.pluginDataDir()
+  if type(dataDir) ~= "string" then
+    return nil
+  end
+  return dataDir .. "/navigation-state.json"
+end
+
+local function saveNavigation()
+  if vaultPath == "" then
+    return
+  end
+  local path = navigationStatePath()
+  if path == nil then
+    return
+  end
+  local entry = selectedEntry()
+  noctalia.writeFile(path, noctalia.json.encode({
+    vaultPath = vaultPath,
+    currentDir = currentDir,
+    selectedRelative = entry ~= nil and tostring(entry.relative or "") or "",
+  }))
+end
+
+local function loadNavigation(): { vaultPath: string, currentDir: string, selectedRelative: string }?
+  local path = navigationStatePath()
+  if path == nil then
+    return nil
+  end
+  local raw = noctalia.readFile(path)
+  if type(raw) ~= "string" then
+    return nil
+  end
+  local saved = noctalia.json.decode(raw)
+  if type(saved) ~= "table"
+    or type(saved.vaultPath) ~= "string"
+    or type(saved.currentDir) ~= "string"
+    or type(saved.selectedRelative) ~= "string"
+  then
+    return nil
+  end
+  return {
+    vaultPath = saved.vaultPath,
+    currentDir = saved.currentDir,
+    selectedRelative = saved.selectedRelative,
+  }
+end
+
 local function fullMarkdown(note: any): string
   local lines = note.lines or {}
   if #lines == 0 then
@@ -245,6 +294,7 @@ local function setSelected(index: number)
   end
   selected = math.max(1, math.min(index, #visible))
   previewTop = 1
+  saveNavigation()
   render()
 end
 
@@ -452,6 +502,7 @@ local function enterSelected()
     selected = 1
     previewTop = 1
     applyFilter()
+    saveNavigation()
     render()
   else
     enterReader(entry)
@@ -473,6 +524,7 @@ local function goParent()
     end
   end
   previewTop = 1
+  saveNavigation()
   render()
 end
 
@@ -827,7 +879,11 @@ local function completeIndexLoad(selectAfterRefresh: string?, actionAfterRefresh
       selected = 1
       applyFilter()
     end
+  elseif pendingNavigation ~= nil then
+    selectRelative(pendingNavigation.selectedRelative)
   end
+  pendingNavigation = nil
+  saveNavigation()
   render()
 end
 
@@ -945,14 +1001,19 @@ validateVault = function(candidate: string?, actionAfterValidation: string?)
     vaultName = tostring(info.name or "")
     obsidianVaultId = type(info.vaultId) == "string" and info.vaultId or nil
     obsidianError = type(info.obsidianError) == "string" and info.obsidianError or nil
-    currentDir = ""
-    selected = 1
     if actionAfterValidation == "save" then
+      pendingNavigation = nil
       local dataDir = noctalia.pluginDataDir()
       if type(dataDir) == "string" then
         noctalia.writeFile(dataDir .. "/vault-path.txt", vaultPath)
       end
     end
+    if pendingNavigation ~= nil and pendingNavigation.vaultPath == vaultPath then
+      currentDir = pendingNavigation.currentDir
+    else
+      currentDir = ""
+    end
+    selected = 1
     refreshIndex()
   end, 10000)
 end
@@ -969,11 +1030,12 @@ local function configuredVaultPath(): string
 end
 
 function onClose()
+  saveNavigation()
 end
 
 function onOpen(_context)
-  -- A plugin runtime can outlive panel-close/open cycles, but user navigation
-  -- must always reopen at the finder root.
+  -- A plugin runtime can outlive panel-close/open cycles; restore navigation
+  -- only when it belongs to the currently configured vault.
   vaultEditMode = false
   vaultEditPath = ""
   searchMode = false
@@ -987,6 +1049,7 @@ function onOpen(_context)
   readerMode = false
   readerNote = nil
   query = ""
+  pendingNavigation = loadNavigation()
   currentDir = ""
   selected = 1
   previewTop = 1