[$250] Add share option to saved searches

[MelvinBot]

Description

Add a "Share" option to saved searches so users can share their saved search with others.

The implementation should focus on a simple copy link flow using the existing "Copied" pattern (the same UX used when copying a message — the row changes to a green checkmark and says "Copied"):

1. User clicks the three-dot menu on a saved search
2. Sees a "Share" option
3. Clicks "Share" — the saved search URL is immediately copied to the clipboard
4. The "Share" row updates to show a green checkmark with "Copied" text (matching the existing copy-message pattern)
5. User can then share the link with other users (via Expensify chat, Slack, email, etc.)
6. When another user opens the link, the search is displayed and can be saved to their account
7. If the user is not signed in, they'll be routed to the sign-in page. Once authenticated, they'll need to click the link again to navigate to the search result.
8. If the recipient has fewer permissions than the sharer, they may see fewer or no results
   Slack thread: https://expensify.slack.com/archives/C07NMDKEFMH/p1775761229242319

Issue Owner

Current Issue Owner: @jayeshmangwani

Upwork Automation - Do Not Edit

• Upwork Job URL: https://www.upwork.com/jobs/~022046507541167305324
• Upwork Job ID: 2046507541167305324
• Last Price Increase: 2026-04-21

[flaviadefaria]

Mockup here:

CleanShot.2026-04-10.at.15.59.03.mp4

As a note for posterity, I think the Save button should turn green (primary action) whenever a search result is displayed. But first, let's wait for the Filters revamp to be done - #81558 before proposing additional changes.

[melvin-bot]

Triggered auto assignment to Design team member for new feature review - @dubielzyk-expensify (NewFeature)

[flaviadefaria]

@dubielzyk-expensify I believe we can use the mockup that @shawnborton shared in the Slack thread and that I added above - thoughts?

[dubielzyk-expensify]

We can and should. That mock looks good to me. Will reassign to him as to give him the credit and have him follow the process through 😄

[flaviadefaria]

Awesome - adding the External label here.

[melvin-bot]

Triggered auto assignment to Contributor-plus team member for initial proposal review - @jayeshmangwani (External)