docs: add abdennourzahaf as a contributor for doc (CopilotC-Nvim#689)

* docs: update README.md [skip ci]

* docs: update .all-contributorsrc [skip ci]

* [pre-commit.ci] auto fixes from pre-commit.com hooks

for more information, see https://pre-commit.ci

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Co-authored-by: allcontributors[bot] <46447321+allcontributors[bot]@users.noreply.github.com>
Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>

fix: correct chat config handling

When opening chat and asking questions, ensure proper config inheritance
by deep extending chat state config with provided config and global config.
Also move config handling before early returns to maintain consistency.

Closes CopilotC-Nvim#676

Signed-off-by: Tomas Slusny <slusnucky@gmail.com>

chore(doc): auto generate docs

chore(doc): auto generate docs

refactor(mappings): improve key mapping API and descriptions

Replace direct mapping key access with named mapping lookups to improve code
organization. Add descriptive labels to keymaps using the plugin name and
mapping name. This change makes the key mapping system more maintainable
and provides better documentation in the key binding help.

refactor: improve diff handling implementation

Extract diff handling into separate class to reduce code duplication and improve
maintainability. Add custom highlighting namespace in diff class and remove
redundant code from overlay class. Add utility function for finding lines
between patterns. Improve diff accepting/showing logic with proper line number
handling.

Move highlighting setup into dedicated diff class and make overlay class more
focused. Add example for code snippet markdown links in prompts to improve
clarity.

Signed-off-by: Tomas Slusny <slusnucky@gmail.com>

Show only error message from curl instead of whole object

Signed-off-by: Tomas Slusny <slusnucky@gmail.com>

Improve token counting and use token count from github response

Signed-off-by: Tomas Slusny <slusnucky@gmail.com>

ensure claude enabled

Null-check model choice after :CopilotChatModel

If you dont select anything and just ESC it sets the model to nil atm.

Signed-off-by: Tomas Slusny <slusnucky@gmail.com>