docs: expand yazi and fzf shortcut notes

Add plugin keyshort pages and update yazi keyshort index.

Made-with: Cursor

Author: CHANGE_ME

pages/fzf___Keyshort___Search for items starting with prefix.md

@@ -0,0 +1,3 @@
+- [[fzf/Keyshort]] [[Keyshort]]
+	- **How to use `fzf` to search for items beginning with a prefix** [[card]]
+		- `^<prefix>` regex works in fzf for requiring that `<prefix>` occurs at the beginning

pages/yazi___Keyshort.md

@@ -3,5 +3,7 @@
 	- [[yazi/Keyshort/Help/Open]]
 	- [[yazi/Keyshort/Help/Filter]]
 	- [[yazi/Keyshort/Leader]]
+	- [[yazi/Keyshort/Plugin/fzf/Fuzzy pick subtree]]
+	- [[yazi/Keyshort/Plugin/Zoxide/Open interactive picker]]
 	- [[yazi/Keyshort/Sort/Time/Modification]]
 	- [[yazi/Keyshort/Sort/Time/Birth]]

pages/yazi___Keyshort___Plugin___Zoxide___Open interactive picker.md

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+- [[Keyshort]] [[yazi]] [[yazi/Keyshort]] [[yazi/Keyshort/Plugin/Zoxide]]
+	- **Jump with zoxide’s interactive picker (fzf-backed)** #card
+		- Shortcut: `Z` (uppercase)
+		- Context: File list / manager pane (default keymap); built-in **zoxide** plugin
+		- Description: Opens **zoxide’s interactive UI** to jump by frecency; that UI **uses fzf** as its picker (requires **zoxide** and **fzf** installed, and zoxide initialized so the DB is populated). Optional: `require("zoxide"):setup { update_db = true }` in `~/.config/yazi/init.lua` to record dirs on cd. See [Builtins | Yazi — zoxide.lua](https://yazi-rs.github.io/docs/plugins/builtins).

pages/yazi___Keyshort___Plugin___fzf___Fuzzy pick subtree.md

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+- [[Keyshort]] [[yazi]] [[yazi/Keyshort]] [[yazi/Keyshort/Plugin/fzf]]
+	- **Fuzzy pick files and directories under the current directory** #card
+		- Shortcut: `z` (lowercase)
+		- Context: File list / manager pane (default keymap); built-in **fzf** plugin
+		- Description: Opens fzf to fuzzy-select **files and directories in the subtree under the current directory** (or among selections). Distinct from uppercase **`Z`**, which runs the **zoxide** plugin. See [Builtins | Yazi — fzf.lua](https://yazi-rs.github.io/docs/plugins/builtins).