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Fix "file not found" errors when WebDAV clients access files/dirs inside directories with spaces. The issue occurred because StatCache was mixing URL-escaped and unescaped paths, causing cache key mismatches. Specifically, StatCache.set() parsed WebDAV responses containing URL-escaped paths (ex. "Dir%20Space/file1.txt") and stored them alongside unescaped cache keys (ex. "Dir Space/file1.txt"). This mismatch prevented StatCache.get() from correctly determining whether a child file existed. See https://github.com/tailscale/tailscale/issues/13632#issuecomment-3243522449 for the full explanation of the issue. The decision to keep all paths references unescaped inside the StatCache is consistent with net/http.Request.URL.Path and rewrite.go (sole consumer) Update unit test to detect this directory space mishandling. Fixes tailscale#13632 Signed-off-by: Craig Hesling <craig@hesling.com>