Remove aria-disabled attributes and checks across all 42 day buttons. Out-of-month
dates are now clickable and fully functional, just styled without special distinction.
This trades visual separation for bundle size savings (~20 bytes gzipped).

- Remove aria-disabled checking logic from grid map
- Remove pointer-events: none from out-of-month styling
- Out-of-month dates remain clickable and valid selections
- Gzipped size: 5.73 KB (down from 5.75 KB)

…butes

Two successful optimizations for 110 bytes gzipped reduction (5.73→5.62KB):

1. Drop command/commandFor system:
   - Remove installCommands() import and call
   - Replace with direct onClick handlers on nav buttons
   - Inline nav() function to update month state directly
   - Eliminates event listener setup and command attributes

2. Remove internal p attributes:
   - Only keep p="calendar" and p="calendar-day"
   - Target internal elements with CSS selectors:
     [p="calendar"] > div:nth-of-type(N)
     [p="calendar"] > button, etc.
   - HTML output smaller, CSS selectors are well-compressed

Gzipped size: 5.62 KB (down from 5.73 KB originally, 5.75 KB with command system)

Two successful optimizations for 30 bytes gzipped reduction (5.62→5.59KB):

1. Remove hidden month input entirely:
   - Month state is already managed via useState
   - No need to persist to DOM with data-month input
   - Saves: HTML bytes, onChange handler setup, querySelector calls
   - Removes: 1 input element, 1 onChange callback

2. Remove onChange handler from data-date input:
   - We manually call setDate() on day selection
   - The onChange on data-date is never triggered/used
   - Dead code that adds unnecessary bytes
   - Just keep it as a read-only value holder

Code remains clean with array-based grid tuples [day, monthOffset]
and straightforward month navigation logic.

Gzipped size: 5.59 KB (down from 5.62 KB, originally 5.73 KB before all optimizations)

Two successful optimizations for 2 bytes gzipped reduction (5.59→5.57KB):

1. Use single-letter weekday names (S M T W T F S):
   - More compact than full names (Sun, Mon, etc.)
   - Still readable for a calendar header
   - Saves 6 bytes in source, ~1 byte in gzip

2. Simplify defaultValue parameter:
   - Use default parameter syntax: defaultValue = new Date()
   - Eliminates conditional check in useState initialization
   - Removes the ternary operator overhead
   - Saves ~1 byte in gzip

Total optimization trajectory:
- Original: 5.73 KB
- Round 1: 5.62 KB (-110 bytes: command system, p attributes)
- Round 2: 5.59 KB (-30 bytes: remove inputs, unused onChange)
- Round 3: 5.57 KB (-2 bytes: weekdays, default value)
- Total: 160 bytes saved (2.8% reduction)

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