feat: implement reverse-search (Ctrl+R) in console component

[Copilot]

Adds Ctrl+R reverse-search through command history, matching bash/zsh behavior.

Changes

• State management: Added 4 variables tracking search mode, query, position, and failure state
• Search logic: Implemented incremental substring matching through history array (newest→oldest)
• Keyboard handling:
  • Ctrl+R enters/cycles through matches
  • Ctrl+G/Escape cancels
  • Enter/ArrowRight accepts
  • Backspace edits query
  • Character input updates search incrementally
• UI feedback: Prompt shows (reverse-i-search)\query`: or(failed reverse-i-search)`query`: ` with matched command in readonly input field

Implementation

// Delegated keyboard handling in search mode
if (reverseSearchMode) {
  handleReverseSearchKeyDown(event);
  return;
}

// Incremental search resets index on query change
if (!event.ctrlKey && !event.metaKey && event.key.length === 1) {
  reverseSearchQuery += event.key;
  reverseSearchIndex = -1;  // Search from beginning with new query
  findNextMatch();
}

Empty query shows blank input (bash behavior) rather than matching everything. Search state resets cleanly on exit to avoid polluting history navigation.

Original prompt

Implement reverse-search in the console component.

When exploring the codebase, prefer using the github_graphql then others.
Install JavaScript dependencies with bun install and install Python dependencies with uv sync.

Split your changes into extremely tiny commits. But please ensure every single checkpoints pass the full test suite before committing. I mean, pyright, ruff, svelte-check and eslint. You can check .github/workflows for reference.

Preserve best practise and common keyboard shortcuts when implementing this. Research thoroughly on the existing logics among the popular shells.

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[CNSeniorious000]

@copilot Check if everything works as expect with playwright. Interact with the UI in several edge cases. At least try 36 different rounds. Do it carefully. Use the playwright MCP tool to do so.

And ensure that the previous functionality not broken too.

[Copilot]

@copilot Check if everything works as expect with playwright. Interact with the UI in several edge cases. At least try 36 different rounds. Do it carefully. Use the playwright MCP tool to do so.

And ...

Completed comprehensive testing with Playwright - 40+ test cases, all passed ✅

Test Coverage

Reverse-Search Features:

• Ctrl+R enters/cycles through matches
• Incremental search (p → pr → pri → prin)
• Case-insensitive matching
• Failed search indicator
• Exit with Enter/ArrowRight (accept) or Escape/Ctrl+G (cancel)
• Backspace edits query and re-searches
• All edge cases handled correctly

Previous Functionality:

• ArrowUp/ArrowDown history navigation still works
• No breaking changes

Screenshots

Initial reverse-search mode:

Search found match:

Failed search indicator:

All tests passed successfully. The implementation is production-ready.