[bferanmi806-sketch]

Summary

Implements #1318: the four shared history tiles and pie view can show this month, last month, or a month selected with the native picker. The API uses calendar days in the box's timezone and keeps the current month partial. EV-cost endpoints are unchanged.

Month selection now waits for the box's runtime timezone and recalculates the current month at interaction time, including month boundaries. A custom selection no longer highlights This month. Month charts scroll horizontally at a readable day width, with a subtle directional cue only while days extend beyond the visible area; Week returns to the compact layout, and the chart region supports keyboard scrolling.

Validation

• Final Linux web suite: 903 tests passed; focused history regressions: 11 passed. JavaScript syntax and diff whitespace checks passed.
• Real local Go API with a fresh isolated data directory, seeded through the built-in backfill utility (1100 days, five-minute samples, seed 1866): verified populated import, production, consumption and export bars plus pie totals. Checked current/last month, February 2024 (29 days), partial current month, and missing-data behavior.
• Desktop and 390px mobile browser review: readable chart labels, horizontal chart scrolling without page overflow, correct custom-month highlight, and populated pie. Before/after screenshots retained for the author's human review.
• A pass-through proxy held September's actual API response for 2.5 seconds. Logs confirmed October arrived first; both bars and pie retained October after the stale September response arrived.
• Timezone helper tests cover differing box/browser calendar months at a UTC boundary, year rollover and invalid metadata. Browser timezone emulation and physical touch scrolling were unavailable. ArrowRight scrolling worked. Five status-poll warnings coincided with restarting the test proxy; no other browser warnings/errors were captured.
• The prior full Go API and make verify passed on the signed pre-follow-up head. This follow-up changes only web files, so the full Go checks were not repeated. The earlier verify run skipped its Avahi container run and release Docker-context checks because the test container had no Docker daemon.

Integration and review

Still draft pending the author's visual review. Actual hunk comparisons found no shared changed lines with #1859, #1862, #1863 or #1751. The closest edits are #1859's live-history rendering beside the selector, #1751's daily response fields after the month range setup, and #1546's EV card insertion after the history cake. Preserve both sets of changes when integrating and rerun the relevant checks after those PRs land.

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Visual comparison

Populated energy history from the actual local API. Month charts now scroll horizontally to keep each day's labels readable; the mobile view no longer highlights This month when a custom month is selected.

View	Before	After
Desktop
Mobile viewport

Mobile captures use a browser viewport, not a physical phone. These images are for the author's visual review; the PR remains a draft.