fix: adapt keyboard shortcut display for macOS

[BingqingLyu]

TLDR

On macOS, keyboard shortcut hints now use native modifier symbols (⌃ for Ctrl, ⌘ for Cmd, ⌥ for Alt, ⇧ for Shift) instead of the generic text format.

Closes QwenLM#2227

Dive Deeper

The CLI keyboard shortcut panel and error retry hints displayed shortcuts like ctrl+y, cmd+v regardless of platform. On macOS, the convention is to use symbolic modifiers (⌃Y, ⌘V).

Changes:

• packages/cli/src/ui/utils/shortcutFormatter.ts — New formatShortcut() utility that converts modifier names to macOS symbols when process.platform === "darwin"
• packages/cli/src/ui/components/KeyboardShortcuts.tsx — Apply formatShortcut() to shortcut key display
• packages/cli/src/ui/hooks/useGeminiStream.ts — Apply formatShortcut() to "Press Ctrl+Y to retry" hint messages
• packages/cli/src/ui/utils/shortcutFormatter.test.ts — Tests for Mac symbol conversion, multi-part shortcuts, and non-Mac passthrough

Non-macOS platforms are completely unaffected — the formatter is a no-op on Linux/Windows.

Reviewer Test Plan

1. Run on macOS — verify shortcut panel shows ⌃Y, ⌃C, ⌘V etc.
2. Trigger an API error — verify retry hint shows ⌃Y instead of Ctrl+Y
3. Run on Linux/Windows — verify shortcuts display unchanged (ctrl+y, ctrl+c)

Testing Matrix

	🍏	🪟	🐧
npm run	✅	❓	❓

Linked issues / bugs

Closes QwenLM#2227

[BingqingLyu]

Conflict Group 1

This PR shares modified functions with 4 other PR(s): #106, #6, #9, #96.

These PRs should be reviewed as a batch — merging one may affect the others.

Function	File	Also modified by
showCitations	useGeminiStream.ts	#106, #6, #9, #96

graph LR
    PR55["PR #55"]
    FshowCitations_6790["showCitations<br>useGeminiStream.ts"]
    PR55 -->|modifies| FshowCitations_6790
    PR106["PR #106"]
    PR106 -->|modifies| FshowCitations_6790
    PR6["PR #6"]
    PR6 -->|modifies| FshowCitations_6790
    PR9["PR #9"]
    PR9 -->|modifies| FshowCitations_6790
    PR96["PR #96"]
    PR96 -->|modifies| FshowCitations_6790

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