Chore: misc tune ups

[ryan-roemer]

• Add a debug timer.
• Rename search fn.

[Copilot]

Pull request overview

This PR introduces a debug timer utility and renames the search function for better clarity. The changes add optional performance monitoring capabilities that can be enabled via a URL parameter.

Changes:

• Add a new timing.js module with a debug timer utility that logs performance measurements when enabled
• Rename search function to searchPosts throughout the codebase for better naming clarity
• Integrate timing measurements for key operations (downloads, database creation, query embedding, vector search)

Reviewed changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
public/app/data/timing.js	New module providing debug timer functionality with URL parameter control
public/app/data/search.js	Renamed search to searchPosts, added timing for DB creation and query operations, removed unused performance global
public/app/data/index.js	Updated export to use renamed searchPosts function
public/app/index.js	Updated import and usage to call searchPosts instead of search
public/app/data/api.js	Added timing measurements for data downloads using the new timer utility

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