162 visualise uncertainties in some way

[sebschmi]

No description provided.

[Copilot]

Pull request overview

Adds support in lib_tsshow for visualizing template-switch “equal cost” uncertainty ranges by introducing an “optional” inner-character rendering path and propagating EqualCostRange information from alignment results into the SVG output.

Changes:

• Plumb EqualCostRange from lib_tsalign alignment events into lib_tsshow’s TemplateSwitch.
• Add InnerChar::OptionalInner and logic to mark/insert optional inner characters to visualize the equal-cost range.
• Render optional inner characters with distinct colors in SVG output and add a new FASTA test fixture.

Reviewed changes

Copilot reviewed 8 out of 8 changed files in this pull request and generated 5 comments.

Show a summary per file

File	Description
test_files/twin_variable_length_ts.fa	Adds a new twin-sequence FASTA fixture for variable-length TS cases.
lib_tsshow/src/ts_arrangement/template_switch.rs	Extends TemplateSwitch to carry EqualCostRange.
lib_tsshow/src/ts_arrangement/source.rs	Extracts equal_cost_range from alignment entrance events and stores it in TemplateSwitch.
lib_tsshow/src/ts_arrangement/inner.rs	Introduces OptionalInner and attempts to inject/convert inner chars to visualize the equal-cost range.
lib_tsshow/src/ts_arrangement/index_types.rs	Adds subtraction by signed offsets for strong index types.
lib_tsshow/src/ts_arrangement.rs	Expands “interesting column” detection to include inner-sequence source columns.
lib_tsshow/src/svg.rs	Adds distinct coloring for optional inner chars and updates copy_color API.

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