Add 14d time window to surface full free plan data

[maquchizi]

What & why

On the free Grafana Cloud plan (METRICS_RETENTION_DAYS=14), the largest window with an honest summary figure was 7d — 30d/1y correctly render —. That left the retained 8–14 day slice with no headline figure anywhere, even though the per-site charts already plot it.

This PR adds a 14d window so the full free-plan retention gets a properly-labeled summary, and makes both the overview and detail pages open on the largest window retention actually covers (14d on the free plan, 30d when retention is unlimited). Along the way it centralizes the window definitions and hardens the detail-route window parsing.

Builds on the METRICS_RETENTION_DAYS work (#13) — the clamping that makes 14d show real data already existed in fetchSiteHistory.

Closes #18

Key changes:

• 14d window ({ key: "14d", label: "14 days", seconds: 1_209_600 }, 84 × 4h buckets) added to the single WINDOWS source. Everything window-generic (query fan-out, coverage clamp, mock data) flows through it with no special-casing. Per-site uptime grid widened to sm:grid-cols-5.
• Retention-aware default extracted into a shared, pure defaultWindow(retentionDays) in lib/types.ts, reused by both Overview and the detail page so the two stay in step (no more hardcoded "7d").
• Centralized window definitions: WINDOWS now carries barCount (removing the parallel BAR_COUNT map in lib/buckets.ts), WindowKey is derived from it, and new isWindowKey / windowFromParam helpers own URL ?window= resolution.
• Detail window query reuse: generateMetadata and the page now resolve the window once via the shared helper (so metadata fetches the correct window instead of always 7d), handle repeated ?window= params safely, and set aria-current="page" on the active tab.
• Bug fix: reworked the uptime-bar SVG <title> (mixed text + expression children compiled to a 4-element array) into a single template string, clearing a React runtime warning.
• Docs: docs/configuration.md and README.md describe 14d alongside the retention section.

Type of change

• Bug fix
• New feature
• Documentation
• Refactor / chore

Checklist

• I read [AGENTS.md](https://claude.ai/AGENTS.md) and [CONTRIBUTING.md](https://claude.ai/CONTRIBUTING.md)
• pnpm check passes
• pnpm test passes
• pnpm test:types passes
• pnpm build succeeds
• Added/updated tests for new logic
• Updated docs (README / docs/) if behaviour or configuration changed
• No secrets committed and no Grafana credential given a NEXT_PUBLIC_ prefix

Notes for reviewers

• The change is deliberately window-generic — coveredWindows(), windowWithinRetention(), the query fan-out, and mock data all iterate WINDOWS, so 14d needed no branching. Worth confirming that assumption still holds.
• defaultWindow returns 30d when covered, else the largest covered window — so the overview default under unlimited retention is unchanged; only capped-retention plans shift to 14d.
• Verified in the browser under METRICS_RETENTION_DAYS=14: overview and detail both open on 14d, the uptime grid shows 14 days = 100% with 30d/1y as —, and the detail chart plots the full ~14-day span. Grid lays out cleanly at 5 columns (desktop) and wraps 2+2+1 on mobile.

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Project	Deployment	Actions	Updated (UTC)
probeview	Ready	Preview, Comment	Jul 27, 2026 12:22pm

[kilemensi]

@claude review

[kilemensi]

@codex review

[chatgpt-codex-connector]

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[kilemensi]

Code LGTM!