Fix #24: Replace Remix icons with Heroicons

[AsmitNepali]

Problem

Closes #24. The package referenced Remix icons (ri-*) but did not declare the andreiio/blade-remix-icon package. Consumers without that package hit:

Svg by name "ri-arrow-down-s-line" from set "default" not found

Fix

Replace all ri-* icons with Heroicons, which Filament ships by default — no extra dependency required.

Old (ri-*)	New (heroicon-*)
ri-arrow-down-s-line	heroicon-m-chevron-down
ri-arrow-down-line	heroicon-m-arrow-down
ri-arrow-right-line	heroicon-m-arrow-right
ri-add-line	heroicon-o-plus
ri-delete-bin-line	heroicon-o-trash
ri-arrow-go-back-line	heroicon-o-arrow-uturn-left
ri-edit-line	heroicon-o-pencil-square
ri-circle-line	CSS dot (no circle icon in Heroicons)

Files

• resources/views/timeline.blade.php
• resources/views/entries/activity-log.blade.php
• resources/views/entries/default.blade.php
• src/Support/ActivityLogOperation.php

Tests

vendor/bin/pest — 46 passed.