Prompt gallery (#957)

- [x] show prompt instead of app in autocomplete
- [x] use proper array/list for db (tags)
- [x] don't do <dyad-prompt> - replace inline

e2e-tests/snapshots/prompt_library.spec.ts_create-and-edit-prompt-1.aria.yml

@@ -0,0 +1,7 @@
+- heading "title1" [level=3]
+- paragraph: desc
+- button:
+  - img
+- button:
+  - img
+- text: prompt1content

e2e-tests/snapshots/prompt_library.spec.ts_create-and-edit-prompt-2.aria.yml

@@ -0,0 +1,7 @@
+- heading "title1" [level=3]
+- paragraph: desc
+- button:
+  - img
+- button:
+  - img
+- text: prompt1content-edited

e2e-tests/snapshots/prompt_library.spec.ts_use-prompt-1.txt

@@ -0,0 +1,3 @@
+===
+role: user
+message: [dump] prompt1content