feat: rework Home's About column and columns

[TheSevenPens]

Seven commits reworking Home. The first was reviewed as its own change; the rest came from iterating on the running app.

Layout

The columns swapped. The right column is now everything wanting attention and nothing else; the left leads with About/Resources into your tablets.

before                          after
── left ──────  ── right ──     ── left ──────────────  ── right ─────
needs attention  ABOUT          about   [links]          needs attention
your tablets     HELP           your tablets             [alert]
                 RESOURCES
                 [logo]

The daemon-problem card moved right along with the health list. It was not named in the request, but it is an alert about something needing attention, and leaving it behind would have stranded it between the links and your tablets. Both children of the right column hide themselves when nothing is wrong, so on a healthy machine that column is empty by design — the blank right half is the "all good" signal.

The About section is now two columns — blurb left, links right, under one heading. The links column is Auto, sized to its longest label so it never wraps, with the prose taking what is left; a 50/50 split would wrap the links, which reads worse than a narrower paragraph.

Content

• The logo is gone. 200px of decoration at the foot of a reference column — and the tallest thing on the page, so removing it was most of what stopped Home scrolling.
• The version closes the About paragraph as ordinary prose ("…on Windows. Version v0.73.0 BETA.") rather than taking a row or hanging off the heading.
• Help became a manual page — docs/user/HELP.md, reached by a Get help link. A page has room to say what to include in a post, which is what makes the first reply useful. Linked from the manual twice so it is not an orphan.
• The RESOURCES heading is gone. The links are accent-coloured and underlined, which already marks them as a group — the label was naming something the reader can see.
• Releases (downloads & release notes) → Releases.
• about joins the display layer, matching your tablets and needs attention. It was the last Home heading still dressed as an eyebrow.

Two bits of cleanup that came free

• ~50 lines of code-behind retired. Making one phrase of the Help paragraph clickable required hit-testing the pointer against that run's character range in the text layout, because Avalonia has no inline hyperlink and an embedded button will not baseline-align in flowing text. An ordinary link in a list needs none of it. HelpDiscordUrl went with it.
• A 14px alignment nudge, added and then retired. The columns started at the same y but did not look it: a 44px heading carries far more leading than a 10px eyebrow. Once about joined the display layer both carry identical leading and align on their own, so the offset came back out rather than staying in place doing nothing.

For the reviewer

• Verified live after every step — this was iterated against the running app, not reasoned about.
• Home no longer scrolls at the default window size with four tablets remembered.
• One caveat: at the 800px minimum width the left column is ~380px, so the prose gets roughly 150 once the links take their Auto width. It works, but it is narrow — a width threshold that stacks them vertically would fix it, and I would rather not add one speculatively.
• Build clean, 673/673.

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