fix: Frontend can crash if query string is invalid

[rolodato]

Trying to load a URL with a malformed query string currently crashes the frontend. For example (note the extra = at the end):

https://app.flagsmith.com/project/16945/environment/ihAHot7taBsh6hbHJKdYHs/features?is_archived=false&tag_strategy=INTERSECTION&page=1&search=&sortBy=name&sortOrder=asc=

Fails with:

Uncaught SyntaxError: JSON.parse: expected ',' or '}' after property value in object at line 1 column 110 of the JSON data
    fromParam 

At least one customer ran into this when using the ClearURLs Firefox add-on: https://addons.mozilla.org/en/firefox/addon/clearurls/

It's probably better to use a dedicated hook for accessing the query string instead of parsing it on every fromParam call, but this is a stop-gap solution to at least stop the frontend crashing.

Tested by trying to load an equivalent URL locally.

[vercel]

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Name	Status	Preview	Comments	Updated (UTC)
flagsmith-frontend-preview	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Mar 19, 2025 3:14pm
flagsmith-frontend-staging	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Mar 19, 2025 3:14pm

1 Skipped Deployment

Name	Status	Preview	Comments	Updated (UTC)
docs	⬜️ Ignored (Inspect)			Mar 19, 2025 3:14pm

[github-actions]

Docker builds report

Image	Build Status	Security report
ghcr.io/flagsmith/flagsmith-api-test:pr-5236	Finished ✅	Skipped
ghcr.io/flagsmith/flagsmith-e2e:pr-5236	Finished ✅	Skipped
ghcr.io/flagsmith/flagsmith-api:pr-5236	Finished ✅	Results ✅
ghcr.io/flagsmith/flagsmith:pr-5236	Finished ✅	Results ✅
ghcr.io/flagsmith/flagsmith-private-cloud:pr-5236	Finished ✅	Results ✅
ghcr.io/flagsmith/flagsmith-frontend:pr-5236	Finished ✅	Results ✅

[github-actions]

Uffizzi Ephemeral Environment deployment-62054

☁️ https://app.uffizzi.com/github.com/Flagsmith/flagsmith/pull/5236

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