fix(webui): remove space before [1m] suffix in Gemini model names
The WebUI was generating model names like "gemini-3-flash [1m]" with a space before the suffix, causing 404 errors when Claude Code used sub-agents. Changed to "gemini-3-flash[1m]" (no space). Fixes #97 Co-Authored-By: Claude <noreply@anthropic.com>
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