[FEATURE]: Show model capabilities and context window in TUI model picker #41287

• I have verified this feature I'm about to request hasn't been suggested before.

Describe the enhancement you want to request

The TUI model picker (/models or Ctrl+P → Switch model) only shows model names and provider names. There is no way to see the model's own technical specifications — context window size, supported input modalities (text/image/audio/video/pdf), and reasoning capability — even though this data is already available locally and is shown in the desktop app's model tooltip.

This makes it hard to:

• Pick the right model for a task without checking external docs (e.g. which models accept images/PDFs, which support reasoning)
• Know a model's context window before switching to it, avoiding "exceeding model context limit" surprises mid-session

Related

• [FEATURE]: Show Metadata (e.g. Model Context Limit) while Selecting Models in Opencode CLI Menu #19411 — original feature request (same ask), auto-closed as inactive without being implemented
• feat(opencode): add model details panel in TUI model selection menu #21551 — an unmerged PR that already implemented a model details panel in the TUI picker; closed by automated cleanup, could be revived
• Feature: Show context/output limits in /models command #40792 — asks for context/output limits in /models, but only the numbers, not capabilities/modalities