feat: Add a user-facing report index with search and filtering #179

[lztmdrclht]

Objective #179 :

After running FM-Agent, generate a report.html file to search for, view, and browse reports.

• Each row/entry displays the title, status, file, function, and code location.
• The search function supports text matching in titles, files, and functions.
• Users can combine search with filters.
• Users can sort the visible result set without losing their current filter settings.
• Technical details for each entry can be expanded or collapsed.
• The index is regenerated deterministically based on existing runtime artifacts, without invoking a large language model (LLM).
• The documentation explains how to locate and open the results index.

Features to Be Implemented

It is unclear what the intended behavior is when opening a code file within an HTML file, so this will be addressed later.

[chatgpt-codex-connector]

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[lztmdrclht]

@haoran-ding This PR needs to be reviewed.