Fix staticcheck QF1012 linting errors

[Copilot]

CI Lint job fails due to three QF1012 staticcheck violations introduced with the huh v1.0.0 bump. The fix replaces WriteString(fmt.Sprintf(...)) with the idiomatic fmt.Fprintf(...) in two TUI screen files.

Changes

• internal/tui/screens/clean.go — fix line 494
• internal/tui/screens/dashboard_v2.go — fix lines 439 and 445

// Before
content.WriteString(fmt.Sprintf(" Deleting releases... %d/%d", c.deleteIdx, c.countSelected()))
status.WriteString(fmt.Sprintf(" %d %s", len(d.profiles), profileWord))
status.WriteString(fmt.Sprintf(" %d pending", d.pendingSync))

// After
fmt.Fprintf(&content, " Deleting releases... %d/%d", c.deleteIdx, c.countSelected())
fmt.Fprintf(&status, " %d %s", len(d.profiles), profileWord)
fmt.Fprintf(&status, " %d pending", d.pendingSync)

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