fix(dashboard): drop dead cost UI, make Agent runs page mobile-friendly - #146

Summary

Two asks: surface cost, and fix the Agent runs page on mobile.

Cost — the honest answer

I dug into whether we track cost and we can't recover it from what we have. I fetched the raw Flue ?view=history for live sessions (getsentry/craft#864, getsentry/cli#1371) and there is no token/usage/cost anywhere — not on messages, not on parts (reasoning/text/dynamic-tool only), not on settlements. Flue computes cost internally (PromptUsage.cost.total) but only exposes it via in-container call returns and OpenTelemetry spans — never in the history/updates views the dashboard reads. All live runs report totalCost: 0.

Rather than keep showing a perpetually-empty "$-", this removes the dead cost UI:

• the always-empty Cost column on the Agent runs table
• the cost chips on the detail page (header total, per-session sidebar, active-session summary)

The tool-call and message counts already convey "how much work happened", which is the signal people actually wanted.

Note: real per-run cost is possible but is its own project — all models route through OpenRouter, so we'd capture generation IDs in-container and query OpenRouter per-generation cost. Happy to do that as a follow-up if you want true spend tracking. (Account-total spend via OpenRouter's key API is also a one-call option.)

Mobile — Agent runs page

The screenshot showed the header wrapping, buttons crowding, and a 7-column table forcing horizontal scroll. Now:

• Header + search/per-page rows stack instead of colliding on a phone
• Below md, the table is replaced by tap-through cards (entity, status, agent/model, session + message counts, updated); the full table stays on desktop

Test plan

• vitest run — 123 passed
• tsc --noEmit clean, biome check clean
• pnpm build succeeds
• Visual: confirm the cards render well on a real phone width

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