Consolidate #108, #107, #106, #105, #104

[matej21]

Combines five open PRs into one branch. Each PR's own commits are cherry-picked with -x, in the order listed.

• fix(bindx-form): stop a blur from wiping every error on the field #108 — fix(bindx-form): stop a blur from wiping every error on the field
• feat: JsonField and a Json column handler for forms #107 — feat: JsonField and a Json column handler for forms
• feat(bindx-uploader): let consumers retarget an upload before it writes #106 — feat(bindx-uploader): let consumers retarget an upload before it writes
• fix(bindx-dataview): scope the export query the way the view loads #105 — fix(bindx-dataview): scope the export query the way the view loads
• fix(bindx-ui): quiet the datagrid cell filter affordance, advertise it in the header #104 — fix(bindx-ui): quiet the datagrid cell filter affordance, advertise it in the header

Conflicts

None. All twelve commits applied cleanly; packages/bindx-form/src/index.ts is the only file two PRs touch, and both edits are additive exports that merged automatically.

Deviation from the originals

One extra commit, fix(bindx-form): drop the Json handler's blur re-report, resolves a semantic conflict between #107 and #108 that git could not see — the two PRs touch different files.

#107 wrote createJsonHandler.onBlur against the blur behaviour on main, where useFormInputValidationHandler cleared every error on the field. To survive that wipe, the handler re-reported its parse error on each blur. #108 narrows the blur to clear only its own html5-validity error, so the parse error now survives by itself — and the re-report appends a second copy of it. One more copy on every blur, unbounded until the next keystroke clears non-sticky errors.

The commit removes the re-report and keeps the rest of onBlur (the formatOnBlur reflow, still skipped while the input is broken).

Neither PR's tests caught this: the rendered error list does not re-render on the blur, so the duplicates were invisible to a DOM assertion. Measured on the consolidated branch before the fix — 1 error after the change, then 2, 3, 4 after successive blurs; on #107 alone it stays at 1. The added regression test reads the field errors from the store for that reason, and fails with 3 against the unfixed handler.

Verification

• Every PR's own diff compared against the consolidated tree file by file. The only differences are each PR missing the other's additions to packages/bindx-form/src/index.ts — accounted for, nothing lost.
• Cross-PR symbol check: fix(bindx-form): stop a blur from wiping every error on the field #108 changes the clearErrors(source) signature to clearErrors(filter); no call site in any of the other four PRs uses the old string form.
• fix(bindx-ui): quiet the datagrid cell filter affordance, advertise it in the header #104 and fix(bindx-dataview): scope the export query the way the view loads #105 both touch packages/bindx-ui/src/datagrid/, but on disjoint concerns (filter-icon rendering and tooltip focus vs. the toolbar export slot). feat(bindx-uploader): let consumers retarget an upload before it writes #106 is self-contained.
• bun run typecheck, bun run lint, bun run test — 2059 pass, 0 fail.

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