fix: tables columns reset to default

[nitrosx]

Description

This PR enables the user to reload the default settings for datasets and proposals list tables, by selecting table settings menu -> default settings.
Once the default setting option is selected, the table columns will revert back to the defaults configured by the site admin and also the user settings are updated to contain the defaults.

Motivation

This PR is motivated by a better UX and to allow users to revert back to the default view configured by the site admin based to facility policies and to better show the data

Changes:

Please provide a list of the changes implemented by this PR

• Datasets list component
• Proposal list component

Tests included

• Included for each change/fix?
• Passing? (Merge will not be approved unless this is checked)

Documentation

• swagger documentation updated [required]
• official documentation updated [nice-to-have]

official documentation info

If you have updated the official documentation, please provide PR # and URL of the pages where the updates are included

Backend version

• Does it require a specific version of the backend
• which version of the backend is required:

Summary by Sourcery

Enable table columns in proposal and dataset lists to be reset to admin-defined defaults and persist those defaults to user settings.

New Features:

• Allow resetting proposal table column configuration to default settings defined in application configuration.
• Allow resetting dataset table column configuration to default settings defined in application configuration.

Enhancements:

• Align table settings handling in proposal and dataset tables to distinguish between default configuration and user-specific column settings.

[sourcery-ai]

Hey - I've found 1 issue, and left some high level feedback:

• In both proposal and dataset tables, the previous fallback to store-derived default columns has been removed; consider preserving a fallback (e.g. to defaultStoreColumns / defaultTableColumns.columns) when appConfig does not define default list settings to avoid regressions or runtime issues.
• You are casting defaultConfigColumns to TableColumn[] without checking for undefined in both components; it would be safer to guard against missing config before calling convertSavedColumns or provide a sensible default array.
• The console.log("Dataset ngOnInit", ...) in DatasetTableComponent looks like leftover debug logging and should be removed or routed through the application's logging mechanism.

Prompt for AI Agents

Please address the comments from this code review:

## Overall Comments
- In both proposal and dataset tables, the previous fallback to store-derived default columns has been removed; consider preserving a fallback (e.g. to `defaultStoreColumns` / `defaultTableColumns.columns`) when `appConfig` does not define default list settings to avoid regressions or runtime issues.
- You are casting `defaultConfigColumns` to `TableColumn[]` without checking for `undefined` in both components; it would be safer to guard against missing config before calling `convertSavedColumns` or provide a sensible default array.
- The `console.log("Dataset ngOnInit", ...)` in `DatasetTableComponent` looks like leftover debug logging and should be removed or routed through the application's logging mechanism.

## Individual Comments

### Comment 1
<location> `src/app/proposals/proposal-table/proposal-table.component.ts:130-131` </location>
<code_context>
                 const tableSort = this.getTableSort();
                 const paginationConfig = this.getTablePaginationConfig(count);

+                const defaultConfigColumns = 
+                  this.appConfig?.defaultDatasetsListSettings?.columns;
+
</code_context>

<issue_to_address>
**issue (bug_risk):** Guard against missing or empty defaultConfigColumns before converting

Previously, missing/empty config columns fell back to `defaultStoreColumns`. Now `defaultConfigColumns` is passed straight into `convertSavedColumns` and cast to `TableColumn[]`, so an undefined/empty value could cause runtime errors or an empty table. Please either preserve the earlier fallback (e.g., to `userConfigColumns` or another default) or explicitly handle `!Array.isArray(defaultConfigColumns)` / `!defaultConfigColumns.length` before calling `convertSavedColumns`.
</issue_to_address>

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[sourcery-ai]

issue (bug_risk): Guard against missing or empty defaultConfigColumns before converting

Previously, missing/empty config columns fell back to defaultStoreColumns. Now defaultConfigColumns is passed straight into convertSavedColumns and cast to TableColumn[], so an undefined/empty value could cause runtime errors or an empty table. Please either preserve the earlier fallback (e.g., to userConfigColumns or another default) or explicitly handle !Array.isArray(defaultConfigColumns) / !defaultConfigColumns.length before calling convertSavedColumns.