fix(editor): configure completion navigation keys

[ggallovalle]

Summary

• Add an Editor setting for palette/completion navigation keys: Ctrl+N/P, Ctrl+J/K, or both
• Update panel and wikilink completion hints to reflect the configured mode
• Keep CodeMirror completion navigation shortcuts from bubbling into global Search Notes while autocomplete is active

Fixes #98

Verification

• npm run typecheck --workspace @zennotes/app-core
• npm run test:run --workspace @zennotes/app-core -- palette-nav.test.ts
• NODE_OPTIONS=--localstorage-file=/tmp/zennotes-vitest-localstorage.json npm run test:run --workspace @zennotes/app-core

Notes

• npm run build reached TS/web/desktop builds, then failed in the local Go server build because the local Go toolchain/std library versions differ: go1.26.2 compiled packages vs go1.26.4-X:nodwarf5 tool.

[ggallovalle]

Manual test plan:

1. Settings mode: Ctrl+N/P

   • Settings → Editor → Panel navigation keys = Ctrl+N/P
   • In editor, type [[
   • Ctrl+N moves completion down.
   • Ctrl+P moves completion up / stays bounded.
   • Ctrl+J / Ctrl+K do not move.
   • Search Notes must not open.
   • Footer says Ctrl+N/P.

2. Settings mode: Ctrl+J/K

   • Type [[
   • Ctrl+J moves down.
   • Ctrl+K moves up.
   • Ctrl+N / Ctrl+P do not move.
   • Search Notes must not open.
   • Footer says Ctrl+J/K.

3. Settings mode: Both

   • Type [[
   • Ctrl+N, Ctrl+P, Ctrl+J, Ctrl+K all navigate.
   • Search Notes must not open.
   • Footer says Ctrl+N/P or J/K.

4. Slash/date completions

   • Type / at line start.
   • Repeat configured/unconfigured shortcut checks.
   • Expected: configured keys navigate; unconfigured keys do not open global panels.

5. No autocomplete open

   • Close completion with Esc.
   • Press Ctrl+P.
   • Expected: normal Search Notes opens.

6. Panels

   • Test Search Notes, Command Palette, Buffer Palette, Outline, Template palette, Vault text search.
   • Configured shortcuts move selection.
   • Unconfigured shortcuts do not move selection.
   • Ctrl+P does not toggle/open Search Notes from inside another panel.
   • Footer hint matches setting.

7. Edge cases

   • Empty [[zzzz completion.
   • First item + previous key.
   • Last item + next key.
   • Vim mode on/off.
   • Insert mode vs normal mode.
   • Pinned reference editor completion.
   • Template editor completion.

Fail if:

• Search Notes opens while a CodeMirror completion tooltip is visible.
• Hint disagrees with setting.
• Configured keys do not move.
• Unconfigured keys trigger global panels while completion is visible.

[ggallovalle]

Disclosure: this change was implemented with assistance from an AI coding agent (OpenAI Codex) under maintainer direction and review.