feat(web): file mentions now open files in the editor - #31407

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Bumping — this was auto-closed by the cleanup bot on age/reaction count, not on its merits, and the capability is still absent.

It's repeatedly requested and still open: #13430 (web, incl. file:line), #31406 (what this PR closes), #17209 / #37891 (desktop), #17478. File paths shown in chat are still plain, non-clickable text.

One thing worth flagging for whoever rebases: the code has moved since June. The message renderer now lives in packages/session-ui/src/components/markdown.tsx, and there is already a linkify path there — markCodeLinks() -> codeUrl() — which only accepts /^https?:\/\//. The clean fix is to extend THAT path so workspace file paths also produce a file-link anchor, rather than adding a second independent path-sniffer. A standalone "contains a dot and isn't a URL" heuristic will false-positive on version strings, "e.g.", numeric ranges, etc.

Happy to see this land; a rebased PR against current dev would be trivial.