feat: simplify archived post indicator

[jamesleesaunders]

Towards #6707

Proposal

This PR has been raised as a follow up for #6156

Whilst I appreciate the potential necessity to indicate whether a post has been backdated in the past, when the above feature was added this did then conflict with the way I personally use Bluesky (and previously X/Twitter) as a microblog diary of my family life etc. Having bulk loaded all my old Twitter (and Facebook) history into Bluesky I was keen to maintain the original dates and scroll back chronologically to read them.

This is a proposal for a kind of half-way solution where, rather than having two dates appear on a post, we only show one (the 'createdAt' date) but make it more obvious (i.e red) that is is not the original 'indexedAt' date. Not only does this mean the post looks less cluttered, but I think it is more obvious.

Changes

• Consolidate Indexed and Created date fields into one.
• Make Backdated indicator Red rather than Orange (more obvious?).
• Swap dates over on Feed also so can scroll back thought time.

Example screenshots:

Current Post:

Proposed Post (consolidate down to 1 date):

Archived Message (remains the same):

Non-Backdated Post (remains the same):

Current Feed (shows indexed_at date):

Proposed Feed (shows created_at date):

I appreciate this is somewhat undoing the previous feature, but I just wanted to raise this PR if only for discussion as to the impact to my diary kind of use case for Bluesky. See my profile for example where you will see my diary (imported from Twitter) going back to 2003 by all posts at the moment now mostly all say '2mo' (2 months). lol

[jamesleesaunders]

Also see discussion on #6707