Upgrade bubbletea, lipgloss, and bubbles to v2; require Go 1.25.0

[Copilot]

Migrates from the github.com/charmbracelet/* v1 packages to the charm.land/*/v2 vanity-domain packages, following the Bubble Tea v2 upgrade guide. CI is updated to target Go 1.25.0.

API changes

• Import paths: github.com/charmbracelet/{bubbletea,lipgloss,bubbles} → charm.land/{bubbletea,lipgloss,bubbles}/v2
• View() return type: string → tea.View; all returns wrapped with tea.NewView(...)
• Key messages: tea.KeyMsg → tea.KeyPressMsg
• Color types: lipgloss.TerminalColor removed in v2; parseColor/highContrastColor now return color.Color (image/color)

// Before
func (m Model) View() string {
    return m.containerStyle.Render(content)
}
case tea.KeyMsg:

// After
func (m Model) View() tea.View {
    return tea.NewView(m.containerStyle.Render(content))
}
case tea.KeyPressMsg:

Infrastructure

• go.mod: bumped to go 1.25.0 (required by charm.land/lipgloss/v2)
• CI workflows (ci.yml, release.yml): go-version: stable → go-version: '1.25.0'

Original prompt

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This section details on the original issue you should resolve

<issue_title>Upgrade bubbletea</issue_title>
<issue_description>Upgrade as shown at https://github.com/charmbracelet/bubbletea/blob/main/UPGRADE_GUIDE_V2.md

Ensure that all CI actions run successfully using go 1.25.0</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes Upgrade bubbletea #4

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