fix(reader): Save/Cancel in the note editor closes the whole popover

Cancel only collapsed the editor section, and edit-mode saves only set
noteOpen=false — the minimized popover (colors/pencil/copy/delete) stayed
up. Explicit Save and Cancel now call hideSelectionPopover; color tweaks
with the editor open still keep it open.

templates/reader.templ

@@ -194,7 +194,7 @@ templ Reader(user User, metadata ReaderMetadata) {
 							type="button"
 							class="flex-1 py-1 text-xs border rounded hover:opacity-80"
 							style="border-color: var(--border);"
-							@click="selectionPopover.noteOpen = false"
+							@click="hideSelectionPopover()"
 						>Cancel</button>
 					</div>
 				</div>