ENG-2168 Add documentations for Advanced node search (Obsidian)

apps/website/content/obsidian/core-features/_meta.ts

@@ -6,6 +6,7 @@ const meta: MetaRecord = {
   "discourse-context": "Discourse context",
   canvas: "Canvas",
   "node-tags": "Node tags",
+  "node-search": "Node search",
   "querying-discourse-graph": "Querying",
 };
 

apps/website/content/obsidian/core-features/node-search.md

@@ -0,0 +1,60 @@
+---
+title: "Node search"
+date: "2026-08-23"
+author: ""
+published: true
+---
+
+**Node search** is a dedicated surface to search and interact with discourse nodes in your vault.
+
+## Open the search
+
+1. Open the command palette with `Cmd/Ctrl + P`
+2. Search for "node search" and select **Discourse Graph: Open node search**
+
+![Node search modal with ranked results and a preview](/docs/obsidian/node-search-results.png)
+
+## Filter by node type
+
+There are two ways to narrow results to particular node types. Both drive the same filter, so you can start with one and finish with the other.
+
+### From the filter dropdown
+
+Click the funnel icon to the right of the search field and tick the node types you want.
+
+![Node type filter dropdown](/docs/obsidian/node-search-type-filter.png)
+
+- **Only** — appears when you hover or focus a row, and narrows the filter to that single type
+- **Clear filter** — removes the filter entirely and shows the count of types currently selected
+- A **Filter types…** box appears once you have more than seven node types configured, so a long list stays manageable
+
+A badge on the funnel icon shows how many types are selected. Selecting every type is the same as selecting none — both show all your nodes.
+
+### From the keyboard, as tag chips
+
+Start typing a node type's name in the search field and its full name appears as ghost text with a `Tab` hint.
+
+![Typing a node type name shows a Tab completion hint](/docs/obsidian/node-search-type-completion.png)
+
+Press `Tab` to turn it into a chip. The search field clears so you can immediately type another type name, or start typing the title you're actually looking for.
+
+![Two node type chips beside a search query](/docs/obsidian/node-search-type-chips.png)
+
+## Sort the results
+
+Click the sort icon to choose how results are ordered.
+
+![Sort dropdown with five dimensions and direction toggle](/docs/obsidian/node-search-sort.png)
+
+Notes with no resolvable author sort after every named author, in both directions.
+
+## Act on a result
+
+The footer shows what you can do with the highlighted result, and every action there is clickable as well as keyboard-driven.
+
+| Action                                     | Shortcut       |
+| ------------------------------------------ | -------------- |
+| Insert a link to the result at your cursor | `Cmd/Ctrl + ↵` |
+| Open the result in a new tab               | `↵`            |
+| Open the result in a split                 | `Shift + ↵`    |
+| Close the search                           | `Esc`          |