fix: add-company modal not closing after successful save

[Lp-Francois]

What

• close the Add Company modal when company save succeeds (right now it doesn't, which lead people to create several times the same company... see screenshot). Kind of related to my other PR: feat: add owner-only company deletion flow #396 (which allow deletion of these multiple companies 😅 )

• keep existing non-redirect refresh behavior by setting reload=true
• switch query state handling in CompanyForm to update both reload and addCompany (addCompany controls the modal)

Why

When creating a company from /companies?addCompany=true, the modal stayed open after a successful save because addCompany was never reset to false. This leads people to think the save didn't happen.

Testing

• bun run typecheck (from apps/cursor)

---

Note

Low Risk
Small query-param and modal state fix on the companies form with no auth or data-layer changes.

Overview
Fixes the Add Company modal staying open after a successful save when opened via /companies?addCompany=true.

On success, CompanyForm now clears the addCompany query flag (which drives the modal) while still setting reload=true so the companies list refreshes without a full redirect. Previously only reload was updated, so users often saved again and created duplicate companies.

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