fix(ui): restore the pre-rebrand gittensory_ legacy localStorage keys - #7895

Sandboxed PR scan did not produce a valid agent receipt. No inline review comments exist. There is one thread comment from superagent-security[bot] with <!-- brin-check --> (a contributor flag, not a clean summary or finding). Current labels: contributor:flagged only.

Let me now analyze the changes against the scan areas:

1. CI/CD: No workflow files present. No findings.
2. Lifecycle: No package-manager hooks, build.rs, setup.py hooks, Docker, or git hooks. These are React UI components. No findings.
3. Malicious intent: The diff restores two gittensory_ localStorage key string literals (card dismissal preference, notification opt-in). No secret exfiltration, obfuscation, encoded payloads, unexpected network calls, dependency confusion, credential handling, dangerous eval/exec, or hidden behavior. The PR body mentions `sess