feat(tui): ctrl+l/ctrl+m to open model switcher

[caarlos0]

maybe its not too obvious how to switch models?

if so, maybe this would help? (unsure about the key bind itself though - ctrl+m == enter).

refs #1273

[aymanbagabas]

Bubble Tea will only return ctrl+m when enhanced keyboard is enabled. Otherwise, pressing ctrl+m gives the same control code as enter which Bubble Tea reports as msg.String() == "enter" for both of these events.

[andreynering]

Working nice now. I really miss this! Hope to get it merged soon 😄

[LarsArtmann]

Working nice now. I really miss this! Hope to get it merged soon 😄

Same here.

[Copilot]

Pull Request Overview

This PR adds a new keyboard shortcut for opening the models dialog, with support for keyboard disambiguation to prefer "ctrl+m" over "ctrl+l" when supported.

• Introduces a new Models key binding that supports both "ctrl+l" and "ctrl+m"
• Implements keyboard enhancement detection to dynamically update help text to prefer "ctrl+m" when disambiguation is supported
• Updates the "Switch Model" command shortcut display to show "ctrl+l"

Reviewed Changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 2 comments.

File	Description
internal/tui/keys.go	Adds the Models key binding with "ctrl+l" and "ctrl+m" keys
internal/tui/tui.go	Implements keyboard enhancement detection and Models dialog handler; removes auto-close logic for commands dialog when opening sessions
internal/tui/page/chat/chat.go	Adds models binding to help display with keyboard disambiguation support
internal/tui/components/dialogs/commands/commands.go	Updates "Switch Model" command to display "ctrl+l" shortcut

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