fix(lint): replace explicit-any types + unused-expressions ternaries

Five files, all stylistic:

- useFlowPilotSession.ts: typed the axios error shape with a narrow
  inline type instead of \`as any\`.
- FlowPilotSessionPage.tsx: same — typed location.state once, then
  destructured.
- ScriptBuilderTab.tsx: handleViewScript was a placeholder no-op;
  declared the args properly with \`void script; void filename\` so the
  signature matches ScriptBuilderChatProps without no-unused-vars
  firing.
- TicketsPage.tsx: replaced 8 ternaries-as-statements (\`x ? f() : g()\`)
  with proper if/else blocks. Same control flow, satisfies
  no-unused-expressions, and reads better in the URL-param update paths.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

frontend/src/hooks/useFlowPilotSession.ts

@@ -100,11 +100,13 @@ export function useFlowPilotSession(): UseFlowPilotSession {
       setCurrentStep(firstStep)
     } catch (e: unknown) {
       // Prefer the backend's detail message over the generic axios status string
-      const detail = (e as any)?.response?.data?.detail
+      const axiosErr = e as { response?: { status?: number; data?: { detail?: unknown } } }
+      const detail = axiosErr?.response?.data?.detail
       const message = typeof detail === 'string' ? detail : (e instanceof Error ? e.message : 'Failed to start session')
       setError(message)
       // Global axios interceptor already shows a toast for 5xx — skip duplicate
-      if (!(e as any)?.response?.status || (e as any)?.response?.status < 500) {
+      const status = axiosErr?.response?.status
+      if (!status || status < 500) {
         toast.error(message)
       }
     } finally {