fix(ui): preserve decoded route parameters
React Router already decodes dynamic path segments before exposing them through useParams. Decoding those values again crashes pages for names containing a literal percent sign and mutates escape-like substrings.
Use route parameters as-is, encode the model editor API path at the outbound boundary, and cover all affected pages with Playwright.
Fixes#11882
Assisted-by: Codex:gpt-5 eslint playwright
Signed-off-by: QiuLG <l237455523@outlook.com>
