Update about dialog title from 'Kiro-Krew' to 'Elasticache Krew'

[jbrinkman]

Problem Statement

The about dialog currently displays "Kiro-Krew Version Information" as its title. This needs to be updated to reflect "Elasticache Krew" branding.

User Story

As a user, when I run the about command in the REPL, I should see "Elasticache Krew Version Information" as the dialog title instead of "Kiro-Krew Version Information".

Acceptance Criteria

• The about dialog title is changed from "Kiro-Krew Version Information" to "Elasticache Krew Version Information"
• The change is in /internal/tui/commands.go at line 422 in the handleAbout() function
• The about command displays the correct title when invoked
• No other references to "Kiro-Krew" or "Kiro Krew" are modified (only the about dialog title)

Context

The title string is passed to activateOverlay() in the handleAbout() function:

m = m.activateOverlay(overlayAbout, "Kiro-Krew Version Information", m.aboutDialog.GetFullContent())

This should be changed to:

m = m.activateOverlay(overlayAbout, "Elasticache Krew Version Information", m.aboutDialog.GetFullContent())