fix: 'View all N' pipeline links now filter to that column's status

[smartcalsystems-sketch]

Problem

Columns cap at 8 cards and show "View all {n} in Bounty pipeline" → /issues. The link carries no status, and /issues's status facet only supported all/open/in_review, so there was no way to view all claimed, funded, or awaiting payout (merged) bounties the column was summarising, even if the link had carried the status.

Fix

• Expanded STATUS_VALUES in bounty-query.ts to cover every status PipelineBoard renders a column for: open, funded, claimed, in_review, merged.
• Threaded each column's status into PipelineColumn and used it to build the link as /issues?status=<status> instead of a bare /issues.
• filterBounties already compares b.status against query.status generically, so no change was needed there — it works for the new values automatically.

Scope note: the three status pills rendered on /issues itself (All/Open/In review) are unchanged. Visiting /issues?status=funded (etc.) filters correctly, it just won't highlight a pill — same as how the reward-range filters today have no corresponding pill either. Adding pills for every pipeline status felt like a separate, larger UI decision outside what this issue asks for; happy to add them too if that's wanted.

Testing

• Added 2 tests: a column's "View all N" link carries ?status=<that column's status>, and this holds for multiple overflowing columns simultaneously (not just the default facet values).
• Full PipelineBoard.test.tsx: 9/9 passing (7 pre-existing + 2 new).
• bounty-query.test.ts + issues/page.test.tsx: 37/37 passing, zero regressions from the STATUS_VALUES change.
• tsc --noEmit and eslint clean on all changed files.

Closes #693

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