fix(journal): correct ordinal suffix lookup and add regression tests

[manfredlift]

Summary

Fixes journal_range page lookup for Logseq journals with ordinal date suffixes (for example Feb 15th, 2026) and adds regression tests.

Problem

JournalRange currently tries:

• d.Format("Jan 2nd, 2006")

In Go time formatting, nd is treated as a literal string, so dates like the 15th are formatted as Feb 15nd, 2026 instead of Feb 15th, 2026.

As a result, valid Logseq journal pages are missed and entriesFound can incorrectly be 0.

Changes

• Replaced inline date formatting in JournalRange with journalPageNames(d time.Time).
• Added ordinalSuffix(day int) with correct suffix logic:
  • 11, 12, 13 -> th
  • otherwise: 1 -> st, 2 -> nd, 3 -> rd, default th
• Preserved existing fallback formats:
  • 2006-01-02
  • January 2, 2006
• Added tests in tools/journal_test.go:
  • TestOrdinalSuffix
  • TestJournalPageNames_UsesCorrectOrdinalSuffix

Result

journal_range now correctly matches standard Logseq journal names with ordinals, including pages like:

• Feb 15th, 2026
• February 15th, 2026

Notes

This PR is intentionally scoped to suffix generation and lookup behavior; it does not change query semantics beyond fixing date-name matching.

[manfredlift]

@skridlevsky can you take a look when you get a chance?

[skridlevsky]

@manfredlift Great catch - thanks for the fix! Merged.