[Omni] Fix snap selection injection on web pages

[numbers-official]

Summary

This fixes the "Failed to start selection mode" error when choosing a select area and clicking Snap Selection. The selection overlay is now injected from src/background/service-worker.ts on demand for valid web pages, avoiding broad http://*/* and https://*/* host permissions that could complicate Chrome Web Store review. The unused src/content/selection-overlay.ts content script has been removed.

Changes

• Move snap selection overlay setup into src/background/service-worker.ts using runtime script injection.
• Restrict extension host permissions to the required Numbers API domain instead of all HTTP/HTTPS pages.
• Remove the obsolete src/content/selection-overlay.ts content script.
• Update vite.config.ts so the removed content script is no longer built.

4 files changed, +233 additions, -229 deletions

File changes

.omni/e42f8a19-untitled/memory.md |  23 ++++
 src/background/service-worker.ts  | 212 +++++++++++++++++++++++++++++++++++-
 src/content/selection-overlay.ts  | 224 --------------------------------------
 vite.config.ts                    |   3 +-

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