Fix: the menu items are highlighted when the input values changes from default

[BrindaS42]

Description : Highlight modified parameters in menu and search

Adds visual indicators for household variables that differ from defaults. Modified items are now highlighted in the menu with bold text and a blue dot.

Fixes #50

Changes:

• Detect modified variables by comparing inputs with defaults and propagating state through the navigation tree.
• Update menu rendering to visually mark modified items.

Video for changes made

highlighted_menus

Tests

passed all the existing test cases. UI works properly, tested manually as shown in video

[vercel]

@BrindaS42 is attempting to deploy a commit to the PolicyEngine Team on Vercel.

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[anth-volk]

Hi @BrindaS42,

Apologies for the delay in getting back to you around the holidays. This repo is actually going to be sunset at some point and this issue is probably quite out-of-date. As such, unfortunately, I'll be closing this PR, but thank you for your effort!