Standardize search bars + mobile pass for miner views

[anderdc]

Summary

UX cleanup of the cleanup branch — search-bar standardization, the dashboard crown eyebrow, footer width, and a mobile pass over the miner dashboard + detail pages.

Search bars

• Transactions / Reservations / Active Rates now share one treatment: start-aligned search icon, mono 0.75rem, square corners, divider border that lightens on hover and turns primary on focus.
• Removed the "Filters live as you type. Press enter to see all matches." hint under the reservations search. The <form onSubmit> is intact, so Enter still navigates to /reservations/by-source/{addr}.

Dashboard crown eyebrow

• Now reads like the miner eyebrow — uid N @ <live crown rate> τ · EMA <ema> τ — showing the live crown rate alongside the existing smoothed EMA (previously only EMA was shown).

Miners-page eyebrow

• StickyNetworkHeader is no longer position: sticky — it scrolls away with the page. (Name kept for now; see notes.)

Footer

• Footer content is now full-bleed (dropped inner maxWidth: 1400), matching TopNav and the dashboard.

Mobile (below the md / 900px breakpoint)

• Miners dashboard: hide Crown History + rate chart; leaderboard is horizontally scrollable, hides the hotkey column, responsive font sizing, header stacks/search goes full-width.
• Miner detail: hide Crown History + the miner rate graph.
• Swap history table: hide the initiated and dur columns; responsive font sizing.

Verification

• npm run lint ✅
• npm run build (tsc -b && vite build) ✅
• prettier --check ✅ on touched files

Notes / follow-ups (non-blocking)

• StickyNetworkHeader is no longer sticky but keeps its name — candidate for a rename in a later cleanup.
• Crown History / rate charts are unmounted (not display:none) on mobile, so deep-linked ?pair/?crownRange/?rateRange/?pan params are inert on phones — intentional for perf.
• Mobile cutoff is md (900px), so portrait tablets also get the trimmed view.
• Footer full-bleed extends slightly wider than the 1400-capped pages (Miners/MinerDetail) on very wide monitors — consistent with the dashboard.