Fix weekly view buttons and add ISO week format docs

[salmonumbrella]

Summary

• Fixes Weekly View buttons intermittently not showing up #494: Weekly View buttons now consistently display by moving button rendering from hashchange listener to h1 observer, which reliably fires when the header element appears in the DOM
• Fixes Support Week I YYYY as a weekly format #409: Documents ISO week format support (Week I YYYY) that was already available via date-fns but not documented

Changes

Issue #494 - Weekly View buttons intermittent display

Root cause: The original implementation used setTimeout with 0ms delay after hashchange, but the h1 element may not exist in the DOM yet on some page transitions.

Fix: Moved the button rendering logic into the existing h1Observer callback which uses createHTMLObserver to reliably detect when h1 elements with class rm-title-display appear. This ensures buttons are always rendered when the header is available.

Issue #409 - ISO week format support

Added documentation for ISO week-numbering tokens that are already supported:

• I / II - ISO week number
• R / RRRR - ISO week-numbering year

Examples like {monday:RRRR}-W{monday:II} → [[2024-W52]] now documented.

Test plan

• Navigate to a weekly note page - buttons should appear
• Navigate away and back - buttons should appear consistently
• Try using ISO week format like {monday:RRRR}-W{monday:II}
• Verify navigation buttons work with ISO week format

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📥 Commits

Reviewing files that changed from the base of the PR and between 93e5548 and 2d19b1d.

📒 Files selected for processing (2)

• docs/weekly-notes.md
• src/features/weekly-notes.ts

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