feat(user-select): improve multi-user login selection

[jimlee2048]

⚠️ Note: This PR and code were generated with help from GPT‑5.2. I have NO frontend dev experience, so this should be considered a prototype for discussion. Please evaluate carefully before merging; if changes are needed, I may need maintainer guidance to apply them correctly.

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Summary

Improve the multi-user login experience by replacing the existing-user dropdown with a searchable, keyboard-friendly user picker that scales better with long user lists.

Changes

• What:
  • Update UserSelectView to use an autocomplete-style selector for existing users (type to filter, arrow keys + Enter to select, dropdown button supported).
  • Reuse the repo’s existing fuzzy search utilities to filter usernames locally.
  • Enhance AutoCompletePlus with opt-in props to avoid PrimeVue overlay/focus edge cases in this login flow:
  • Keep the dropdown open and show all users when the input is cleared.
  • Blur the input after a user is selected while preserving the selected value (mouse and Enter selection).
  • Add unit tests covering the new behavior and the PrimeVue edge cases guarded by the new opt-in props.

Review Focus

• AutoCompletePlus opt-in behavior (keepOpenOnEmptyInput, blurOnOptionSelect) and whether the internal overrides are acceptable for upstream maintenance (they are disabled by default and only enabled on the multi-user login view).
• User selection behavior when typing partial matches and selecting via Enter vs mouse (no clearing, no flicker).
• Test coverage and whether the new component-level tests are sufficient.

Fixes #7555

Screenshots (if applicable)

demo.mp4

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