chore: clarify web sync changeset wording

Reword two synced changesets to describe the actual upstream code-app
changes (#420, #439). Release contents unchanged.

Author: kimi-agent-bot

.changeset/fresh-placeholders-type.md

@@ -2,4 +2,4 @@
 "@moonshot-ai/kimi-code": patch
 ---
 
-web: Fix the first keyboard or IME character possibly being swallowed after clicking the placeholder hint in an empty composer.
+web: Render the rich composer placeholder outside the editor, fixing the first typed/IME character being swallowed.

.changeset/right-panel-interaction-polish.md

@@ -2,4 +2,4 @@
 "@moonshot-ai/kimi-code": patch
 ---
 
-web: Polish right sidebar interactions.
+web: Unify right-side panel headers and give the OpenIn menu a file mode (copy absolute path, editor picker, full-path tooltip).