Add fallback for missing company dashboard name

[SimplyRayYZL]

Fixes #70.

Summary:

• Adds a safe fallback for missing/blank company names in the dashboard greeting.
• Hides the company description paragraph when the description is empty instead of rendering an empty/undefined value.

Validation:

• Inspected the company dashboard render path in frontend/app/app/company/page.tsx.
• Ran pnpm --filter frontend exec tsc --noEmit; the command reaches existing repo TypeScript target issues in test files that use BigInt literals, unrelated to this touched page. The edited page type-checks through the optional string fallback expressions.

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