Fix broken web user journeys across exploration pages

[Kvnbbg]

Motivation

• Repair multiple legacy exploration flows that were non-functional due to missing JS handlers and invalid asset references on several static pages.
• Restore consistency across the web UI so secondary pages behave as continuations of the main dashboard experience.

Description

• Added legacy element selectors and three initializer functions in web/app.js (initializeExploreJourney, initializeCarsJourney, initializeNbaJourney) and invoked them at load time to wire search, add-item, cars request feedback, and NBA table/matchups interactions.
• Fixed broken asset and script references across web/explore_home.html, web/cars.html, web/gym.html, and web/nba.html by switching to the existing styles.css, app.js, and correct ../assets/images/... and favicon paths.
• Corrected malformed social link markup and replaced stray script.js/style.css references, and added “Back to dashboard” navigation links on secondary pages to improve journey continuity.

Testing

• Ran node --check web/app.js to validate the modified JS syntax, which succeeded.
• Searched HTML files for stale references (rg -n 'facebook""|href="style.css"|src="script.js"' web/*.html) and verified no matches remained.
• Confirmed repository state with git status --short and committed the tracked changes; all automated checks listed above passed.

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Codex Task

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