feat: add conditional fields and more source variants to FormBuilder

[danielo515]

Summary

Fills a few gaps in the programmatic FormBuilder API so it matches what the form editor UI and schema already support:

• Conditional fields (Closes Set conditionals when using Form builder #385) — every builder method now accepts an optional condition: input.Condition, so you can do:

  builder("example")
      .text({ name: "trigger" })
      .text({
          name: "child",
          condition: { dependencyName: "trigger", type: "isSet" },
      })
      .build();

• selectFromNotes({ name, folder }) — previously select was locked to the fixed source; this is the notes-backed variant.
• multiselectQuery({ name, query, allowUnknownValues? }) — multiselect whose options come from a Dataview query (matches MultiSelectQuerySchema).
• multiselectNotes shortcut — addMultiselectNotesField already existed but had no short alias alongside the other multiselect/select/etc. shortcuts. Now it does.

Under the hood, the existing methods were refactored to use a ...rest spread over FieldArgs so the new condition option flows through without changing their public signatures.

Test plan

• npm run build (lint + svelte-check + esbuild production bundle) passes — 0 errors, only pre-existing warnings
• npm run test — 167 tests pass (was 159, +8 new), 2 pre-existing skipped
• Preview URL: build the plugin via the dev vault and run a short script using modalForms.builder with .selectFromNotes(...), .multiselectQuery(...), and a condition: on a field to confirm the built FormDefinition shape opens without validation errors

https://claude.ai/code/session_011up9cgw8Q9B38umdVuonM9

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[greptile-apps]

Greptile Summary

This PR expands the programmatic FormBuilder API to match existing form capabilities. The main changes are:

• Adds optional conditions to every builder method.
• Adds notes-backed select fields.
• Adds Dataview-backed multiselect fields.
• Adds the missing multiselect-notes shorthand.
• Adds tests for the new field shapes and defaults.

Confidence Score: 5/5

This looks safe to merge.

• No blocking issues found in the changed code.

Important Files Changed

Filename	Overview
src/core/FormBuilder.ts	Adds conditional fields and new select and multiselect variants while preserving schema-compatible field shapes.
src/core/FormBuilder.test.ts	Covers the new source variants, shorthand, defaults, and conditional-field output.

_{Reviews (2): Last reviewed commit: "Merge branch 'master' into claude/lucid-..." | Re-trigger Greptile}