feat(tui): console copy-to-clipboard via opentui

[edlsh]

Closes #4885

Supersedes #5239 — uses opentui's new onCopySelection callback from sst/opentui#411.

Changes

• Updated @opentui/core and @opentui/solid to 0.1.61
• Wired renderer.console.onCopySelection callback for clipboard integration
• Removed manual MouseParser implementation (now handled by opentui)

Features (from opentui)

• Mouse selection: Click and drag to select text in console
• [Copy] button: Clickable button in console title bar
• Keyboard shortcut: Ctrl+Shift+C to copy selection
• OSC52 support: Works in tmux and terminals supporting OSC52

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Context: https://github.com/sst/opencode/issues/4885#event-21603684651