When writing text to the clipboard via PowerShell (WSL2 and native Windows),
the previous implementation piped text through stdin using `Set-Clipboard
-Value $input`. PowerShell reads stdin using the Windows system's default
ANSI code page (e.g. CP936 for Chinese Windows), causing all non-ASCII
characters (CJK, emoji, accented) to become garbled.
Fix: encode the text as base64 in Node.js and pass it as a command argument.
PowerShell decodes it from base64 using explicit UTF-8, bypassing the code
page issue entirely.
Fixes#35107
Selected rows in the model/session/skills pickers and approval/clarify
prompts only changed from dim gray to cornsilk, which reads as low
contrast on lighter themes and LCDs (reported during TUI v2 blitz).
Switch the selected row to `inverse bold` with the brand accent color
across modelPicker, sessionPicker, skillsHub, and prompts so the
highlight is terminal-portable and unambiguous. Unselected rows stay
dim. Also extends the sessionPicker middle meta column (which was
always dim) to inherit the row's selection state.
annguyenNous