feat: add interactive terminal font size zoom controller #113

[prakshithamalla-art]

Feature Implemented

Integrates an independent, scalar terminal text font sizing panel directly within the active console workspace sub-header framework. This allows developers to adjust workspace text presentation dynamically on the fly to fit different display forms without distorting or scaling global interface layouts.

Technical Details

• Added dedicated increment/decrement action buttons (#btn-zoom-in, #btn-zoom-out) and a live value display layout element into the .cli-header-right flex block container within ui/index.html.
• Attached a persistent tracker state key (state.terminalFontSize) utilizing a native fallback configuration mechanism in ui/app.js.
• Implemented runtime click event handlers inside the bindEvents() routine with strict boundary validation rules (min: 11px, max: 20px) to instantly alter element typography layout sizes.
• Integrated a configuration persistence pipeline via localStorage snapshot hooks to ensure user font preferences reload instantly on next application boot.

Closes #113