feat(format): add date case transforms

[chhoumann]

Summary

Extend QuickAdd's existing per-placeholder |case: contract to DATE, TIME, and VDATE output. This lets a capture target such as ## {{DATE:dddd, MMMM Do, yyyy.|case:lower}} match an intentionally lowercase daily-note heading while preserving exact Insert after matching.

Fixes #1667.

Changes

• Format date and time text in the active Moment locale, then apply the requested case transform.
• Compose DATE snapping before casing and keep VDATE's stored value unchanged so each occurrence can choose its own rendering.
• Reserve an explicit trailing |case:<style> modifier while preserving other literal pipes; bracketed |case: text remains literal Moment format text.
• Extend format autocomplete and builder previews, including ordinal Do previews, and document the next-release syntax in format and capture guides.
• Add focused formatter, parser, suggestion, preview, compatibility, and isolated Obsidian capture regression coverage.
• Scope Linux launcher contract tests to Linux so the full suite does not fail on macOS /tmp canonicalization.

Testing / validation

• pnpm run test (4,931 passed, 41 skipped)
• pnpm run build-with-lint
• pnpm run check (0 errors, 0 warnings)
• pnpm --dir docs run build (50 pages)
• Isolated Obsidian 1.13.4 E2E spec: exact capture into Daily/2026-08-11.md under ## tuesday, august 11th, 2026. passed with verified file mutation.
• Live builder inspection: the exact field previews ## friday, august 14th, 2026.; typing |case:l opens a visible, non-overlapping lower suggestion and restoring the field preserves the preview.

Checklist

• PR title follows Conventional Commits; it becomes the squash-merge commit and drives the released version.
• Linked any related issue(s).
• Noted release/migration impact: no migration is required. |case: becomes a reserved trailing modifier for date/time formats; literal modifier-like text must be bracketed. Documentation is marked for the next release.

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