fix(ui): temporarily raise project session list ceiling (NeuralNomadsAI#604)

## Summary

- raise PROJECT_SESSION_LIST_LIMIT from 1,000 to 10,000
- keep sessions visible for projects whose subagent activity exceeds the
current 1,000-session cap
- leave the existing one-shot project-scoped request behavior unchanged

## Context

This is an urgent temporary mitigation for the regression described in
NeuralNomadsAI#565 (comment).

PR NeuralNomadsAI#565 replaced paginated loading with a single request capped at 1,000
sessions. Projects that exceed that cap can still have all sessions in
OpenCode's database, but older sessions disappear from the CodeNomad UI.

This PR deliberately does not solve the underlying scalability problem.
The follow-up fix should restore proper paginated loading and remove
reliance on a fixed high ceiling.

## Validation

- npm run typecheck --workspace @codenomad/ui
- node --test packages/ui/src/stores/session-pagination.test.ts (5
passed)

Author: pascalandr

packages/ui/src/stores/session-list-options.ts

@@ -1,4 +1,4 @@
-export const PROJECT_SESSION_LIST_LIMIT = 1000
+export const PROJECT_SESSION_LIST_LIMIT = 10000
 
 type ProjectSessionListInput = {
   directory?: string