Document claiming old (>90 days) bridge messages

[jlwllmr]

The native bridge app retains unclaimed messages for 90 days; after that, they must be claimed manually either by calling the function on the block explorer, filling in the necessary parameters, or with the SDK.

The PR implements a flow where:

1. Users likely to be in this situation encounter a callout on the main bridge page. This is the entry point for the flow because it's the most likely place to go if you're facing bridging issues of any kind.
2. It directs them to the message service reference, which now contains a section on claiming old messages.
3. The instructions for claiming on the block explorer on L2 are there; if they need to claim on L1, we recommend they head to the SDK guide as this is considerably simpler than manually retrieving the parameters necessary to claim on L1.

[vercel]

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Name	Status	Preview	Comments	Updated (UTC)
doc-linea	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Jun 12, 2025 1:00pm

[mapachurro]

A lot of the time, when I find myself writing bullet points that, like these, begin with the same verb or set of words, I try to rework it, so e.g.

Using the Linea SDK, you can get:

• Contract data

As well as query information about messages:

• By message hash
• By transaction hash
  etc

You can also use the SDK to claim messages.

I offer this purely as a stylistic reflection; you may find it too wordy, for example, or just, like, more effort than it's worth 😆

This looks good, and is a prime example of "how much work went into 1500 words" 🦾