fix(databases): correct enum icon and hide indexed checkbox for relationships

[HarshMN2345]

Summary

• Fix wrong icon shown for enum columns in the create-index field selector — the lookup matched by type only, and since email/ip/url/enum/string columns all share type: 'string', it always resolved to the first match (Email's mail icon) instead of the enum-specific icon.
• Hide the "Indexed" checkbox for relationship columns in the columns table, since relationship columns cannot be indexed (consistent with existing filtering in the create-index field list and the "Create index" action menu item).

Test plan

• Open a table with an enum column, start "Create index", confirm the field selector shows the correct enum icon
• Open a table with a relationship column, confirm the "Indexed" checkbox no longer appears for that column in the columns list
• bun run check / bun run lint pass for the touched files

[greptile-apps]

Greptile Summary

This PR fixes two display bugs in the database table UI. The icon lookup in the create-index field selector now matches on both type and format, so enum/email/ip/url columns each show their correct icon instead of all resolving to Email's mail icon. The "Indexed" checkbox is hidden for relationship columns, which cannot be indexed, making the columns table consistent with the existing filtering in the create-index sheet and the action menu.

• Icon fix (create.svelte): The baseColumnOptions.find now requires option.format === (field.format || undefined), mirroring the identical guard already in +page.svelte (line 407) and correctly disambiguating the five type: 'string' variants.
• Relationship checkbox (+page.svelte): Wraps the indexed Selector.Checkbox in {#if !isRelationship(column)}, using the already-imported helper that's consistently applied elsewhere in the same file.

Confidence Score: 5/5

Both changes are narrowly scoped UI fixes with no data mutations; safe to merge.

The icon lookup change correctly mirrors the existing guard already in use in the columns page, and the relationship checkbox hide uses a well-tested helper applied consistently throughout the file. No logic paths, data flows, or API calls are altered.

No files require special attention.

Important Files Changed

Filename	Overview
src/routes/(console)/project-[region]-[project]/databases/database-[database]/(entity)/views/indexes/create.svelte	Adds format-based disambiguation to the leadingIcon lookup so enum/email/ip/url columns each resolve their correct icon instead of always matching Email first. Logic is now consistent with the identical guard already used in +page.svelte.
src/routes/(console)/project-[region]-[project]/databases/database-[database]/table-[table]/columns/+page.svelte	Wraps the "Indexed" checkbox in {#if !isRelationship(column)} so the cell is empty for relationship columns, using the already-imported helper consistent with other guards in the same file.

_{Reviews (2): Last reviewed commit: "fix(databases): treat empty format as no..." | Re-trigger Greptile}