[Feature] deep link supports search

[appendjeff]

I have searched the existing feature requests, both open and closed, to make sure this is not a duplicate request.

• Yes

The feature

[Feature] Mobile deep link to open a search request

Request

Add a deep link that opens the mobile search screen pre-filled with a filter, primarily a date range:

immich://search?takenAfter=2026-07-08T00:00:00%2B00:00&takenBefore=2026-07-08T23:59:59%2B00:00

(and/or the https://my.immich.app/search?… universal-link form). Immich's current deep links resolve only entity IDs: asset, album, memory, people.

Why

Integrations can already build the web URL https://<instance>/search?query=<json>. On
desktop it opens Immich; on mobile it opens the browser, because a self-hosted domain can't claim the app's Universal/App Links — only Immich-owned domains can. A search deep link would open the app to the right results, like the existing immich://asset|album|memory|people links do.

This will unblock a downstream integration: appendjeff/photo-search-obsidian-plugin#1

I believe that my understanding of deep linking is correct, but I am mostly leaning on Claude Code to help me learn about deep linking.

Estimated Scope

I expect that the scope will be small since other deep linking already exists in the Immich mobile app.

• Routing: mobile/lib/services/deep_link.service.dart — add a case + builder,
  same pattern as the recent people deeplink.
• Pre-fill: drift_search.page.dart already reads searchPreFilterProvider and applies an injected filter on load.
• Model: SearchFilter already has SearchDateFilter { takenAfter, takenBefore }.

It seems to mostly be wiring: parse query params → SearchFilter → set the prefilter provider → route to the search page, plus Info.plist / AndroidManifest.xml registration.

Scope: date range first (takenAfter/takenBefore); optionally a general filter payload (query text, people, tags) later.

Prior art & duplicate check

Extends PR #19232 (deep-link framework) / #25686 (people deeplink). I didn't find an
existing request for a search/date deep link — nearby but different: #2881
(deep-link megathread: album/photo/QR only), #20541 (search query language), #24188
(combining search types), #12046 (multiple-date search API/GUI).

Platform

• Server
• Web
• Mobile