docs: the Raindrop setting now has a writing side

cce-system-interface's Browser page has a "Sync Bookmarks with
Raindrop" toggle for browser.raindrop.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

 CLAUDE.md        | 2 +-
 RAINDROP-SYNC.md | 5 +++--
 2 files changed, 4 insertions(+), 3 deletions(-)

diff --git a/CLAUDE.md b/CLAUDE.md
index 7669ad8..cb054eb 100644
--- a/CLAUDE.md
+++ b/CLAUDE.md
@@ -620,7 +620,7 @@ must never carry an index across a lock boundary.
 in `handle_focus_change` — so edits made in **cce-system-interface's Browser page**
 (`../cce-system-interface/src/pages/browser.rs`, which owns the writing side) apply on
 the next switch back. Keep the key names in `settings.rs` and that page in sync;
-`external-browser` and `raindrop` are currently read here with no UI writing them.
+`external-browser` is currently read here with no UI writing it.
 
 Servo persists per-profile state (cookie jar, auth cache, HSTS) only when given a
 `config_dir` — without one every launch starts logged out of every site. It lives at
diff --git a/RAINDROP-SYNC.md b/RAINDROP-SYNC.md
index 44becc2..3176728 100644
--- a/RAINDROP-SYNC.md
+++ b/RAINDROP-SYNC.md
@@ -109,8 +109,9 @@ the single-instance hand-off, so it works while the browser is open.
 `browser.raindrop` (KDL, `browser { raindrop (bool)true }`, off by default) is
 read at launch and on every focus like the other settings; the worker thread
 `cce-raindrop` starts the first time it is on and idles while it is off. Its
-writing side belongs to cce-system-interface's Browser page and does not exist
-yet — like `external-browser`, it is edited by hand for now. Choices:
+writing side is the "Sync Bookmarks with Raindrop" toggle on
+cce-system-interface's Browser page (`src/pages/browser.rs` there) — keep the
+key name in step with `settings.rs`. Choices:
 
 - **It polls the bookmarks every 2 s instead of being told about edits.** A
   bookmark changes from the star, Ctrl+D, the bookmarks menu and the