Feat/gh 127 search run per params

[marciok]

fix #127

[Copilot]

🟡 Changes recommended

Offset pagination is not deterministically ordered (ties on inserted_at can cause missing/duplicate rows across pages), which risks incorrect pagination behavior for the new filtering/pagination UX.

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Pull request overview

Implements Issue #127 by adding server-side filtering of DAG runs based on run parameter keys/values, wiring the search state through the Run index LiveView (including URL persistence), and updating UI + tests to cover parameter search combined with status filtering and pagination.

Changes:

• Add :params_search support to Flows.get_dag_by_name_with_runs!/2 and Flows.count_runs_on_dag/3 for server-side parameter key/value matching.
• Extend the runs index LiveView to parse/store params_search, push URL patches on search/status/page changes, and filter real-time inserts against the active filters.
• Update the runs index UI (search control + compact pagination) and add/extend tests for matches, no matches, clearing, status combos, pagination, and counts.

File summaries

File	Description
apps/gust/test/flows_test.exs	Adds unit tests for server-side params search behavior, including pagination + status interactions and blank search handling.
apps/gust/lib/gust/flows.ex	Adds :params_search filtering to runs preload and run counting queries.
apps/gust_web/test/gust_web/live/run_live_test.exs	Adds LiveView tests verifying URL persistence, match/no-match states, clearing behavior, pagination preservation, and real-time insert filtering under params search.
apps/gust_web/lib/gust_web/live/run_live/index.html.heex	Adds parameter search UI and replaces the page select with compact pagination buttons.
apps/gust_web/lib/gust_web/live/run_live/index.ex	Wires params_search through LiveView params/events, URL generation, and PubSub-driven run list updates.
apps/gust_web/assets/css/app.css	Adds styling helpers for the new search and status filter forms.

Review details

• Files reviewed: 6/6 changed files
• Comments generated: 2
• Review effort level: Lite

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