feat(frontend): add tracking for Network events

[DenysKarmazynDFINITY]

Motivation

We want to start tracking changes in the Network switcher and Manage networks modal.

[Copilot]

Pull request overview

This PR adds analytics tracking for two network-related user interactions in the frontend application:

1. Network filtering (switching networks using the Network Switcher dropdown)
2. Network management (enabling/disabling networks in the Manage Networks modal)

The implementation adds new Plausible analytics events and contexts to track these actions, along with success/error status information.

Changes:

• Added two new event types (NETWORK_FILTER and NETWORK_MANAGE) to the PLAUSIBLE_EVENTS enum
• Added a new event context (NETWORKS) to the PLAUSIBLE_EVENT_CONTEXTS enum
• Added a new event key (NETWORK) to the PLAUSIBLE_EVENT_EVENTS_KEYS enum
• Implemented tracking in NetworksSwitcher.svelte to log network selection with success/error handling
• Implemented tracking in SettingsModalEnabledNetworks.svelte to log network management changes with success/error handling

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 2 comments.

File	Description
src/frontend/src/lib/enums/plausible.ts	Added new enum values for network tracking events and contexts
src/frontend/src/lib/components/networks/NetworksSwitcher.svelte	Implemented tracking for network selection with error handling and status reporting
src/frontend/src/lib/components/settings/SettingsModalEnabledNetworks.svelte	Implemented tracking for network management changes with status reporting, wrapped save logic in try-catch

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