[AliIbnBotir]

SUMMARY

Implements the Spreadsheet chart proposed in SIP #45265.

Depends on #45263 and #45275. This branch contains their commits, so until they merge, please review only the last commit, feat(plugin-chart-univer): add a Spreadsheet chart built on Univer. I will rebase once they are in.

Adds a new chart type, Spreadsheet (viz_type: univer_sheet, category Table), built on Univer, an Apache-2.0 spreadsheet engine.

• In Explore the query result loads into a spreadsheet editor (toolbar, formula bar, sheet tabs, context menu). Authors can rename headers, format cells, write formulas, add rows and sheets. Edits are saved with the chart in the univer_workbook control.
• On dashboards and embedded the chart is a read-only sheet with the saved edits applied on top of fresh data. It uses appSection from feat(explore): pass appSection to chart plugins #45275 to tell where it renders.
• Query modes: Aggregate, Raw records, and Pivot (rows, columns, metrics, totals). Pivot runs on the backend with the existing pivot and flatten post-processing (which needs the fix in fix(post-processing): flatten every index level #45263) and shows stacked, merged header rows.
• Group rows by dimensions (optional): Excel-style Subtotals groups with +/- buttons, level buttons and a Grand Total. The collapsed state is saved.
• Refresh data on load (default on): the query result is rewritten into the data area each time the chart loads, keeping formatting, formulas outside the data area and other sheets. Query values are stripped before saving, so the saved state only holds the user's edits.

Design notes:

• Only Univer's open source packages are used: @univerjs/presets and @univerjs/preset-sheets-core 1.0.4. No Univer Pro packages. The 93 new lockfile packages are all ASF Category A licences (MIT, Apache-2.0, BSD-3-Clause, ISC).
• Univer is lazy-loaded (loadChart: () => import('../UniverChart')), so it is only downloaded when a Spreadsheet chart renders. Nothing Univer-related is in the entry bundles.
• All Univer calls live in src/univer/mountUniver.ts. Grid, layout, saved-state and group logic is plain TypeScript with unit tests.
• The saved state has a version field so its format can change later.
• Frontend only. The Excel export with edits is a separate follow-up PR. Until it lands, "Export to Excel" on this chart exports the raw query result like other charts.

BEFORE/AFTER SCREENSHOTS OR ANIMATED GIF

_Editing in Explore: rename headers, fill the header row, add an Average row with formulas, save._ _The same chart on a dashboard: read-only, saved edits on fresh data._ _Pivot mode: stacked, merged column headers and totals._ _Row groups: Subtotals rows, collapsing with -/+ and the level buttons, Grand Total._

TESTING INSTRUCTIONS

Automated:

• npm run test -- plugins/plugin-chart-univer src/components/Chart/ChartRenderer.test.tsx
• npm run plugins:build && npm run type

Manual:

1. Create a chart on video_game_sales (or any dataset) and pick Spreadsheet.
2. Aggregate mode: add genre as a dimension and a few metrics, then run the query.
3. In the sheet, rename a header, give the header row a fill colour, insert a row under the data and type a formula such as =AVERAGE(B2:B13). Save the chart.
4. Reload Explore: the edits are kept and the data is fresh.
5. Add the chart to a dashboard: it renders read-only with the edits.
6. Switch to Pivot mode with Rows = genre, Columns = platform: check the merged headers and totals.
7. Back in Aggregate mode, add a second dimension and tick Group rows by dimensions: check the Subtotals rows, the -/+ and level buttons, and that the collapsed state survives a save.

ADDITIONAL INFORMATION

• Has associated issue: SIP [SIP-236] Proposal for a Spreadsheet chart (Excel-like, editable) built on Univer #45265
• Required feature flags:
• Changes UI
• Includes DB Migration (follow approval process in SIP-59)
  • Migration is atomic, supports rollback & is backwards-compatible
  • Confirm DB migration upgrade and downgrade tested
  • Runtime estimates and downtime expectations provided
• Introduces new feature or API
• Removes existing feature or API

The chart is registered unconditionally. If maintainers prefer, it can go behind a feature flag (for example SPREADSHEET_CHART) until it has had wider use.

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