Migrate Braille dot numbering to ISO/Unicode international standard

[Copilot]

The library used a custom dot numbering scheme incompatible with international Braille standards (EU/UK/US), preventing interoperability. This migrates to the ISO/Unicode standard where dots 1-3 occupy the left column, 4-6 the right column, and 7-8 the bottom row.

Changes

Braille Unicode mapping (Braille.db)

• Remapped all 256 dot patterns to correct Unicode Braille characters per UTF-8 U+2800-U+28FF specification
• Example: dot pattern "2" now maps to ⠂ (U+2802) instead of ⠈ (U+2808)

Thai character mappings

• Systematically converted 88 Thai characters using transformation: {1→1, 2→4, 3→2, 4→5, 5→3, 6→6, 7→7, 8→8}
• Visual Braille output unchanged; only internal representation standardized
• Added missing characters: ฤ, ฦ, ใ, ฯ, ฯลฯ and punctuation marks

Mirror function (printbraille)

• Updated swap logic to international standard: {1↔4, 2↔5, 3↔6, 7↔8}

# Before: custom numbering produced correct Unicode but wrong dot semantics
# After: standard numbering with same Unicode output
thai_word_braille("แมว")  # Still outputs ⠣⠍⠺, now using dots [126][134][2456]

All existing tests pass without modification.

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Original prompt

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This section details on the original issue you should resolve

<issue_title>Dots numbering is standardised?</issue_title>
<issue_description>The number patterns used in Thaibraille (here) seems to be unique. Internationally standardised numbering as used in EU, UK, US for 6 dots (2 columns x 3 rows) is (1:top left, 2 middle left, 3 bottom left); (4 top right, 5 mid rt, 6 bot rt) and for 8 dots the 6 dots are shifted up and 2 more dots added as bottom row with numbers (7 bot left; 8 bot rt).

Though the numbering in python code works now, there is a question on communication among international community.</issue_description>

<agent_instructions>Use Internationally standardised numbering
look https://sr12zar.github.io/KoKho/script/Th2Bn.js and https://sr12zar.github.io/KoKho/script/Bn2ThB.js</agent_instructions>

Comments on the Issue (you are @copilot in this section)

@wannaphong I agree. Thaibraille doen't use standardised. I want to fellow Thai standardised but I don't see any standardised in my language (low resource for research), so I was create this project for create Thai Dots numbering that output is Braille Patterns block of the Unicode standard for printing.

• Fixes Dots numbering is standardised? #4

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[coveralls]

Pull Request Test Coverage Report for Build 21702878984

Details

• 0 of 1 (0.0%) changed or added relevant line in 1 file are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 76.344%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
thaibraille/text/core.py	0	1	0.0%

Totals
Change from base Build 21702568635:	0.0%
Covered Lines:	71
Relevant Lines:	93

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💛 - Coveralls