feat(files): unified download dialog, public-upload fix, and upload UX polish

[Nic-dorman]

Splits a batch of upload/download improvements out of a testing session. (Sibling PR for LAN devnet Developer Options is separate — the two touch different regions of lib.rs/en.json and don't conflict.)

Download

• Unified dialog: merges "Download by Address" and "Download by Datamap" into one Download dialog with a smart input that auto-detects and routes:
  • a hex address (0x… / 64 hex) → download_public
  • an autonomi:// link → download_public (parses name / filename+filetype for the save-as name)
  • a local .datamap path or file:// URI → download_file
  • an http(s) .datamap URL → fetch then download_file
  • plus a drop zone for a .datamap file, and an auto-filled save-as name.
• Require a full 64-hex address — the old {8,} check enabled the button then failed in the backend (which requires exactly 32 bytes).
• Fetch a datamap from a URL — new read_datamap_url (reqwest, 15s timeout, 5 MiB streamed cap; parsed via ant-core's format sniffer). The file data still comes from Autonomi, so a hostile URL can't substitute content.

Upload

• Fix: public uploads were silently stored private in direct-key mode (devnet / imported key). wallet_upload now takes visibility and calls the public variant, returning public_address — so the PUBLIC badge and shareable address show. This affected Sepolia and Arbitrum One imported-key uploads too, not just devnet.
• Already-on-network files no longer auto-dismiss the confirm dialog — the private (get the DataMap) vs public (publish the DataMap) choice is a real decision even when the data exists. The approve gate now counts already-stored entries, and the button reads "Get Datamap" for already-stored + private.
• Remove the redundant "Already stored" badge that crowded the filename.

Uploads table

• Address column truncates to the column width (shows the full address when it fits) and never truncates the PUBLIC tag.
• Vertically centre the status column.

i18n

New/updated download+upload strings across all 18 locales. Non-English is machine-generated best guess — will refine with community feedback.

Both this and the sibling branch build clean (tauri dev) and were exercised against a local devnet.

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