[Repo Assist] feat: navigate filtered list with arrow keys without leaving filter mode

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🤖 This PR was created by Repo Assist, an automated AI assistant.

What

Allows ↑ / ↓ / PgUp / PgDn / Home / End to navigate the package list while the LocalFilter prompt is active (Installed / Upgrades views).

Before: All navigation keys were silently ignored in LocalFilter mode. The user had to press Enter to exit the prompt first, then navigate.

After: The cursor moves immediately while typing the filter — the filter text is preserved, only the selection changes. Pressing Esc or Enter still works exactly as before.

Why

Popular TUI filter prompts (fzf, Telescope, Vim's / search) all let you navigate results without leaving the input field. The previous behaviour was a friction point: you'd type a filter to narrow the list, then have to press Enter before you could select the package you wanted.

Change

handle_local_filter_input in src/handler.rs gains six new match arms for the navigation keys, each using the same logic as the equivalent arms in handle_normal_mode. No existing behaviour is changed.

Test Status

cargo check --all-targets  → clean
cargo fmt -- --check       → clean
cargo clippy -- -D warnings → clean
cargo test                 → 232 passed (was 230) — 2 new tests:
  - local_filter_up_down_navigate_without_leaving_filter_mode
  - local_filter_home_end_navigate_to_bounds

Note

🔒 Integrity filter blocked 1 item

The following item were blocked because they don't meet the GitHub integrity level.

• After scrolling, current position is unvisble #151 list_issues: has lower integrity than agent requires. The agent cannot read data with integrity below "approved".

To allow these resources, lower min-integrity in your GitHub frontmatter:

tools:
  github:
    min-integrity: approved  # merged | approved | unapproved | none

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