fix(ui): normalize model picker fuzzy search

[anduimagui]

Issue for this PR

Refs #16710

Type of change

• Bug fix
• New feature
• Refactor / code improvement
• Documentation

What does this PR do?

Model picker search in desktop/app was inconsistent when queries used punctuation or separators (for example gpt_5,3).

This PR adds normalized fuzzy-search helpers in packages/ui/src/hooks/filter-search.ts, adds tests in packages/ui/src/hooks/filter-search.test.ts, and updates useFilteredList to use normalized matching so desktop/app model picker flows behave consistently and prefer normalized prefix matches.

TUI changes are intentionally deferred for a follow-up proposal to keep this PR desktop/app scoped.

How did you verify your code works?

• bun test ./src/hooks/filter-search.test.ts (from packages/ui)
• bun run typecheck (from packages/ui)

Screenshots / recordings

N/A (search behavior/ranking change only)

Checklist

• I have tested my changes locally
• I have not included unrelated changes in this PR

[github-actions]

Hey! Your PR title fix(ui,tui): normalize model picker fuzzy search doesn't follow conventional commit format.

Please update it to start with one of:

• feat: or feat(scope): new feature
• fix: or fix(scope): bug fix
• docs: or docs(scope): documentation changes
• chore: or chore(scope): maintenance tasks
• refactor: or refactor(scope): code refactoring
• test: or test(scope): adding or updating tests

Where scope is the package name (e.g., app, desktop, opencode).

See CONTRIBUTING.md for details.

[github-actions]

Thanks for updating your PR! It now meets our contributing guidelines. 👍

[github-actions]

Thanks for your contribution!

This PR doesn't have a linked issue. All PRs must reference an existing issue.

Please:

1. Open an issue describing the bug/feature (if one doesn't exist)
2. Add Fixes #<number> or Closes #<number> to this PR description

See CONTRIBUTING.md for details.

[rekram1-node]

Automated PR Cleanup

Thank you for contributing to opencode.

Due to the high volume of PRs from users and AI agents, we periodically close older PRs using automated criteria so maintainers can focus review time on the most active and community-supported contributions.

This PR was closed because it matched the following cleanup criteria:

• The PR was created more than 1 month ago
• The PR had fewer than 2 positive reactions
• Positive reactions are counted as thumbs-up, heart, celebration, or rocket reactions on the PR

PRs created within the last month are not affected by this cleanup.

If you believe this PR was closed incorrectly, or if you are still actively working on it, please leave a comment explaining why it should be reopened. A maintainer can review and reopen it if appropriate.

Thanks again for taking the time to contribute.