fix: address PR review feedback (round 2)

Bug fixes:
- Catch OCSError/HTTPStatusError in all server tools, convert to McpError
- Guard update_collective against empty body (raise ValueError)
- Use restore_page response data in status message

ADR-017 annotation fix:
- Distinguish "remove" (reversible association) from "delete" (permanent):
  remove_tag and deck_remove_label_from_card no longer set destructiveHint
- Update annotation test to exclude "remove" from destructive keywords

Data model improvements:
- Add trashTimestamp field to PageInfo
- Create ListTrashedPagesResponse with is_trash context flag
- Add collective_id to ListTagsResponse

Test robustness:
- Read NC credentials from environment variables (not hardcoded)
- Filter landing page by parentId == 0 instead of assuming pages[0]

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

nextcloud_mcp_server/server/deck.py

@@ -641,9 +641,7 @@ def configure_deck_tools(mcp: FastMCP):
 
     @mcp.tool(
         title="Remove Label from Deck Card",
-        annotations=ToolAnnotations(
-            destructiveHint=True, idempotentHint=True, openWorldHint=True
-        ),
+        annotations=ToolAnnotations(idempotentHint=True, openWorldHint=True),
     )
     @require_scopes("deck:write")
     @instrument_tool