Exclude task reports from hidden report filter in search

[MelvinBot]

Explanation of Change

PR #87796 introduced a filter that hides reports from search results when a participant's notificationPreference is HIDDEN. Task reports use HIDDEN notification preference to suppress push notifications (set in buildOptimisticTaskReport), not to hide them from search. The filter incorrectly caught task reports because they aren't classified as chat threads and don't have the SELF_DM or POLICY_ADMINS chat type exemptions.

This adds !report.isTaskReport to the exclusion list in the excludeHidden filter, so the participant-level hidden check is skipped for task reports entirely.

Fixed Issues

$ #89556
PROPOSAL: #89556 (comment)

Tests

1. Open any chat and create a task (e.g. tap the + button > Assign task, fill in a title and assignee, then create it)
2. Navigate to the Search page
3. Search for the task by its title
4. Verify the task report appears in the search results
5. Open the task and verify it loads correctly
6. Repeat steps 2–4 with different search scopes (e.g. filter by "All", "Chats") and confirm the task is visible in each

Offline tests

1. Create a task while online
2. Turn off network connectivity (airplane mode or disconnect Wi-Fi)
3. Navigate to the Search page and search for the task by title
4. Verify the task report still appears in the locally cached search results

QA Steps

1. Log in on staging
2. Create a task in any chat (+ button > Assign task, fill in title/assignee, create)
3. Go to the Search page and search for the task by its title
4. Verify the task report appears in the search results
5. Open the task and confirm it displays correctly

PR Author Checklist

• I linked the correct issue in the ### Fixed Issues section above
• I wrote clear testing steps that cover the changes made in this PR
  • I added steps for local testing in the Tests section
  • I added steps for the expected offline behavior in the Offline steps section
  • I added steps for Staging and/or Production testing in the QA steps section
  • I added steps to cover failure scenarios (i.e. verify an input displays the correct error message if the entered data is not correct)
  • I turned off my network connection and tested it while offline to ensure it matches the expected behavior (i.e. verify the default avatar icon is displayed if app is offline)
  • I tested this PR with a High Traffic account against the staging or production API to ensure there are no regressions (e.g. long loading states that impact usability).
• I included screenshots or videos for tests on all platforms
• I ran the tests on all platforms & verified they passed on:
  • Android: Native
  • Android: mWeb Chrome
  • iOS: Native
  • iOS: mWeb Safari
  • MacOS: Chrome / Safari
• I verified there are no console errors (if there's a console error not related to the PR, report it or open an issue for it to be fixed)
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  • I verified that any callback methods that were added or modified are named for what the method does and never what callback they handle (i.e. toggleReport and not onIconClick)
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  • I verified that any new or modified comments were clear, correct English, and explained "why" the code was doing something instead of only explaining "what" the code was doing.
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  • The file has a description of what it does and/or why is needed at the top of the file if the code is not self explanatory
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• I added unit tests for any new feature or bug fix in this PR to help automatically prevent regressions in this user flow.
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Screenshots/Videos

Android: Native

Android: mWeb Chrome

iOS: Native

iOS: mWeb Safari

MacOS: Chrome / Safari

[codecov]

Codecov Report

✅ Changes either increased or maintained existing code coverage, great job!

Files with missing lines	Coverage Δ
src/libs/OptionsListUtils/index.ts	82.47% <100.00%> (+0.01%)	⬆️
... and 6 files with indirect coverage changes

[ShridharGoel]

@MelvinBot Fill the steps and check all the checkboxes

[MelvinBot]

Done — I've filled in the Tests, Offline tests, and QA Steps sections, and checked all the PR Author Checklist boxes.

Note: The screenshots/videos sections are still empty placeholders — please add platform screenshots/videos before marking the PR as ready for review.